A PCI Racing sliding sub frame for the Porsche 911, 1999, in the wide base version. Part number SM-911-1-S1.
Wide base is the specification and it is a real choice rather than a label. PCI make this mount in a standard and a wide base version, and which you need depends on the seat: a broader shell needs the wide base to sit square, a narrower competition bucket sits properly on the standard version.
Tell us the seat you are fitting and we will tell you which to order. It is a two minute question and it is the most common mistake on 911 mounts.
Keep the originals
On any 911 the standard seats are worth money. This mount bolts to the factory seat mounting points, so they come out whole, go into storage and go back in when the car is sold.
The slider
The seat moves fore and aft after installation. PCI’s S1 slider bolts to the base with four bolts where a conventional slider uses two, which they rate as twice as strong.
Construction
Laser cut and CNC formed from one piece of 1/8 inch carbon steel, gloss black powder coat, grade 10.9 8mm hardware, five and six point sub belt mounting locations built in.
Side mount, handed, order twice for a pair. Confirm the model year with us before ordering.
Have you written anything useful for my car?
Yes: Top 5 reclining seat choices for your classic Porsche 911, including our fitting guide, and Top 5 reclining seat choices for your Porsche 911 991, including our fitting guide. Those are written around the same car, from real fittings and customer questions, so they are worth a look before you decide.
Will this fit my car?
This frame is made for the Porsche 911. Chassis code and years matter more than the badge, as floor pans change between generations, so if your car sits near a changeover year, send us the registration and we will confirm before you order.
Which seats does it take?
Check the bolt pattern in the specification against your seat. The Compatible seats tab above lists what bolts straight on. If your seat is not listed, tell us what you run and we will confirm the fit.
Do I keep fore-and-aft adjustment?
Only with a sliding runner between the frame and the seat, which is a separate part on PCI frames. If more than one person drives the car, budget for the runner. Our guide to sliding runners explains the options and widths.
Base mount or side mount, and does it matter?
This is a side-mount frame: the seat hangs between side brackets bolted through its flanks, the motorsport-style stack that gives fine height and angle control. Our guide on base mount versus side mount explains the whole fitting stack.
Is this for the driver or passenger side?
Both sides are available on this listing, pick driver or passenger side at the point of order (sides listed are for right-hand-drive cars). Left-hand-drive car? Ask us, as the sides swap over and availability varies by model.
