Audi A4 B9 bucket seat guide

The Planted SB375 at 187.46 pounds per seat, listed for the A4 and the S4 B9 from 2016 onwards. It bolts to the factory seat mounting points in place of the standard runners, so a standard floor needs no drilling. It is priced per seat, so changing both front seats means ordering it twice. It is the only frame made for this chassis.

The B9 is the 2016 onwards car. The quickest tell is the front: a wide low hexagonal grille and slim LED headlights with a stepped, almost jagged lower edge, and a sharp crease running down the flanks above the door handles. The B8 before it has a taller, more upright grille and softer sides. It matters because the frames are different part numbers and do not swap. If there is any doubt, send us the registration.

Planted do not publish one for SB375. That is the honest answer and we would rather give it than repeat a guess. It matters because the reclining seats on this page sit on four different patterns, from 291mm x 330mm to 405mm x 280mm. If you are pairing a base mount seat with this frame, send us both part numbers and we will get the pattern confirmed by Planted before you buy either. If you are using side mounts it does not apply.

The Planted listing says the seat mounts to the frame either directly or on side mounts, so both routes are open. Of the buckets here only the Cobra Monaco Pro is listed for base mount as well as side mount, so that is the one seat that goes straight on. Everything else needs a set of side mounts, which start at 29 pounds.

Motordrive do not publish a mounting type for either the Club Pro or the Club Race, and they do not publish a driver height or waist figure either. Both are listed FIA 8855-1999. We are not going to guess at how they fix, so if one of those is the seat you want, ask us and we will get it confirmed with Motordrive before you order. We have flagged the gap on our side as well.

Three cover 36in to 40in waist: the Mirco RTS-2 Velour at 349 pounds, the Sparco Circuit II QRT at 468 pounds and the Corbeau Sprint X System 5 XL at 800 pounds. The first two also cover 32in to 36in on the same listing, so they suit a range of drivers rather than one. The OMP ARS-R covers 36in to 38in. Among the reclining seats, all three Corbeaus cover 32in to 38in.

Corbeau list several of theirs as two seats on one line. The PSR at 465 pounds, the two Sportline RRS at 830 pounds and the two SVR Vinyl at 850 pounds are each a pair, so halve the figure for a per seat comparison. The PSR pair works out at a shade over 230 pounds a seat, which is the cheapest way to change both front seats on a B9. If you only want one, ask us first, because some of the single listings have been retired.

Only if you add a runner. Side mounts on their own hold the seat in one place, which sits lower and suits a car one person drives. The Sparco sliding runner kit at 34.95 pounds is the usual answer on a base mounted seat, and the Cobra premium runners at 70 pounds are the better made option under a Cobra seat. Neither is FIA approved, so treat both as road and trackday parts. On a B9 that is still somebody’s daily, the adjustment is usually worth having.

No. There is no car specific belt for the B9, so you are fitting a universal harness and working out the mounting yourself. That is the harder half of the job on this car. Send us a photo of the area behind your front seats and we will tell you what the shoulder straps can bolt to before you spend anything on belts.

If your class asks for FIA, the Sparco Competition H-3 at 185 pounds is the cheapest current option here, a 6 point steel belt rated FIA 8853-2016 and listed HANS friendly. The Schroth Profi 3×2 and the TRS Magnum 6 Point Superlite are the same standard at 370.01 and 245 pounds. If nobody is going to scrutineer the car, a Takata Drift II or III or a TRS Clubman covers it for less, as long as you are not running a head restraint, because those four are listed as not HANS compatible.

No, and we would rather say so. SW Motorsports build their half cage for the B8, and the Custom Cages A4 kits are listed for the car from 2000 onwards, which is the earlier platform. We are not going to sell you a cage made for a different floor because the title says A4. If you need an anchorage for the shoulder straps, a fabricated harness bar made to fit the car is the usual answer and a much smaller job. Ask us and we will also check with Custom Cages whether anything is planned for this shell.

FIA means the belt passed a test to a written standard. Whether it suits your car is a separate question. Every FIA belt carries a date that ends its competition life whether the belt has been worn or not, so you are buying a clock along with the harness. Buy FIA if your class requires it. For a fast road B9 that will never see a scrutineer, a road and track rated belt does the same job for less money and does not expire.

Usually yes, and it is worth checking properly. The original buckle stays where it is while the seat around it moves, so once the seat is bolted down make sure you can reach the buckle one handed and that the shell is not fouling the stalk. Sort it while the trim is still out and it costs you two minutes instead of an evening.

It is a fair question on a car this age and one we cannot answer for you, because it depends on your dealer and your policy rather than on the parts. What we can say is that the Planted frame bolts to the existing seat mounting points and does not require drilling or cutting, so it is reversible: the standard seats and runners go back in. If you are worried, keep the original parts and speak to your dealer before you start.