Toyota Celica 5th Gen GT4 (ST185) bucket seat guide
ST185, All-Trac GT-Four, 1990 to 1993
All-Trac is the North American name and GT-Four is the one used everywhere else, and it is the same car: the ST185, built 1990 to 1993, the shape that won Toyota the World Rally Championship before a year-long exclusion over an illegal turbo restrictor device. That history is part of why the car still gets built today, and the fitting kit below is confirmed for exactly this chassis rather than the wider Celica range.
The Planted bracket is base mount. From there the seat decides whether side mounts get added, and the cage question is more generous here than on most cars this age, because both Safety Devices and Custom Cages still build kits specifically for the ST185.
- Planted SB253 is confirmed for the ST185, 1990 to 1993, £222.00 base mount
- The OMP TRS-X at £264.00 is listed for both base mount and side mount, and covers the widest waist range on this page
- A Safety Devices 16-point cage and a Custom Cages T45 multipoint cage are both confirmed specifically for the ST185
- A Sparco weld-in cage confirms Version STI85, matching this car exactly, at £893.42
- All FIA harnesses carry a stamped expiry date that ends their competition life regardless of wear
- The standard rear seat belt mounts are not rated for harness shoulder strap loads
The fitting bracket
Planted Technology part number SB253 is confirmed for the ST185, 1990 to 1993, and is base mount. It bolts to the factory floor mounting points. Most bucket seats on this page are side mount, so a set of side mounts on top of the bracket is the usual route. The OMP TRS-X is the exception, listed for base mount as well as side mount, so it fixes directly to the bracket with nothing added.
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Bracket plus the OMP TRS-X
Goes straight on. The TRS-X at £264.00 is also the widest fit on this page, covering 28in to 36in waist and both over and under 6ft across its listing.
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Bracket plus side mounts
For every other bucket seat here. The Sparco FIA steel side mounts at £90.00 fit Sparco, OMP, Cobra and Sabelt shells alike.
The fitting kit
The bracket is priced per seat, so two front seats means two orders.
- Planted Technology SB253, £222.00 per seat, ST185 1990 to 1993, base mount
- Sparco FIA Steel Side Mount Brackets, £90.00 fits Sparco, OMP, Cobra and Sabelt side-mount seats
- Sparco Sliding Runner Kit, £41.94 per seat, 345mm x 271mm bolt pattern
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FIA competition bucket seats
Every seat here carries FIA 8855-1999 homologation. The Cobra Monaco Pro at £235 is the cheapest of them and is listed for base mount as well as side mount, so it also goes straight onto the bracket. The Mirco RS2 3D at £425.40 covers all heights, and the OMP TRS-X above is the widest fit on the page for waist size.
Two premium options sit at the top of the range: the Sparco Evo L QRT at £612.00 and the OMP RT Carbon/Fibreglass at £707.96, both side mount and both confirmed under 6ft, 32in to 36in waist.
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Reclining sport seats
For a GT-Four doing road miles, a reclining seat on the bracket keeps the backrest adjustment. The Sparco R100 at £235 and the R100 Martini Racing at £349.99 both sit on the 345mm x 271mm bolt pattern, matching the Sparco runner above. The Recaro Pole Position with ABE at £1,039.50 is the premium option, road legal with type approval and confirmed under 6ft.
Four Corbeau pairs, the SVR Vinyl, Sportline RRS, Sportline RRB and the PSR, round out the range, all listed on 291mm x 330mm or 345mm x 271mm and covering 32in to 38in waist across the pair.
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Our recommendationStart with the OMP TRS-X if you want no extra hardware
On a bracket this well confirmed, the seat is the open question. Cameron works out the fit and the best combination for a given car, so tell him whether you want a seat that goes straight on, or whether side mounts are already part of the plan, and he will narrow the list from here.
Harnesses
There is no harness made specifically for this car, so you are fitting a universal belt and working out the mounting yourself. The standard rear seat belt mounts are not rated for harness shoulder strap loads, so a cage, a bolt-in harness bar, or a fabricated anchor point is needed.
The Schroth Profi 3×2 at £370 and the TRS Magnum 6 Point Superlite at £294.00 are both FIA 8853-2016. The TRS Magnum 4 Point at £139 is FIA 8854-1998. All three carry a stamped expiry date regardless of wear. For a road or trackday car, the Takata Drift II and III and the TRS Clubman belts cost less, though none of those four are HANS compatible.
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Our recommendationConfirm the anchor before the belt
Tell us whether the car is caged, what is behind the seats now, and whether a head restraint is going in, and we will tell you what the shoulder straps can anchor to before you spend anything on the belt.
Roll cages
This chassis is better served than most for cages this age. Safety Devices list a 16-point bolt-in cage at £938.40 and a rear-only version at £525.60 both titled specifically for the Celica GT-Four. Custom Cages make a T45 multipoint kit at £1,818.30 confirmed for “ST185 inc GT4”. Sparco also list a weld-in cage at £893.42 whose own specification confirms “Version: STI85”, matching this car exactly rather than the wider Celica range.
If competing, check the specification against your class regulations before ordering, and keep the sign-off paperwork with the logbook. Pad any tube within reach of a helmet, and tell your insurer, because a cage is a notifiable modification.
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What fits what
All seats below fit the ST185 on the Planted SB253 bracket, with side mounts added where the mounting column says side mount. Where a cell says not listed, the manufacturer has not published that figure.
| Seat | Mounting | Approval | Driver height | Waist | HANS |
|---|---|---|---|---|---|
| Competition bucket seats | |||||
| Cobra Monaco Pro | Base or side mount | FIA 8855-1999 | Under 6ft | 32" to 36" | HANS friendly |
| OMP TRS-X | Base or side mount | FIA 8855-1999 | Over and under 6ft | 28" to 36" | HANS friendly |
| Mirco GT 3D Fabric | Side mount | FIA 8855-1999 | Under 6ft | 32" to 36" | HANS friendly |
| Mirco RS2 3D | Side mount | FIA 8855-1999 | All heights | 32" to 36" | HANS friendly |
| Sparco Rev QRT | Side mount | FIA 8855-1999 | All heights | 32" to 36" | HANS friendly |
| Sparco Evo L QRT | Side mount | FIA 8855-1999 | Not listed | Not listed | HANS friendly |
| OMP Champ-R | Side mount | FIA 8855-1999 | Under 6ft | 32" to 36" | HANS friendly |
| OMP RT Carbon/Fibreglass | Side mount | FIA 8855-1999 | Under 6ft | 32" to 36" | HANS friendly |
| Reclining sport seats | |||||
| Sparco R100 | Base mount, 345mm x 271mm | Road and track | Over and under 6ft | All sizes | Not listed |
| Sparco R100 Martini Racing | Base mount, 345mm x 271mm | Road and track | All heights | 32" to 36" | Not listed |
| Recaro Pole Position with ABE | Side mount | Road and track | Under 6ft | 32" to 36" | Not listed |
| Sparco R500 Fabric | Base mount, 345mm x 271mm | Road and track | All heights | 32" to 38" | Not listed |
| Sparco GT | Base mount, 345mm x 271mm | Road and track | Under 6ft | 32" to 36" | Not listed |
| Corbeau SVR Vinyl, pair | Base mount, 291mm x 330mm or 345mm x 271mm | Road and track | All heights | 32" to 38" | Not listed |
Common questions
Which fitting bracket does the ST185 need?
Planted Technology SB253, £222.00 per seat, confirmed for 1990 to 1993 and base mount. It is priced per seat, so two front seats means two orders.
Which seat goes straight onto the bracket with no extra parts?
The OMP TRS-X at £264.00 and the Cobra Monaco Pro at £235 are both listed for base mount as well as side mount. Every reclining seat on this page is also base mount. Everything else needs side mounts added.
Is the roll cage the same as the later ST205 GT-Four?
No. Custom Cages and Safety Devices both list separate cages for the ST185 and the ST205, and the two are not interchangeable. This guide covers the ST185 kits specifically.
Which cage is confirmed exactly for this generation?
The Sparco weld-in cage at £893.42 lists “Version: STI85” in its own specification, which is the ST185. The Safety Devices 16-point cages and the Custom Cages T45 kit are also titled specifically for the Celica GT-Four rather than the wider range.
Which harness should I buy?
For FIA competition, the Schroth Profi 3×2 at £370 and the TRS Magnum 6 Point Superlite at £294.00 both meet 8853-2016, and the TRS Magnum 4 Point at £139 meets 8854-1998. For road and trackday use, the Takata Drift II and III and the TRS Clubman belts cost less but are not HANS compatible.
Can I use the standard rear seat belt mounts for the harness?
No. They are not rated for the loads a harness shoulder strap puts through them in an impact. A cage, a bolt-in harness bar, or a fabricated anchor point is needed instead.
Which seat suits a wider driver?
The OMP TRS-X covers 28in to 36in waist, the widest range on this page, and also covers both over and under 6ft on the same listing. Start there if you are broader or taller than average.
More help
If you want the bracket confirmed against your specific car, or a cage checked against your class regulations, the contact link is the quickest way to get it looked at.
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