Complete fitting kit: side mounts included. These frames come with their own side mounts, so any side mount bucket seat bolts straight to them. You only need the seat and the frame, with no separate side mounts to buy. The slider is built in as well, so no separate runner kit is needed.
Belt buckle clip included. Each frame comes with a belt buckle clip, suitable for attaching a harness or the car’s factory seatbelt clip.
A pair of PCI Racing sliding sub frames for the BMW M4. Part number SM-S1-M4-X2.
Both sides in one order, handed for driver and passenger.
Keep the factory seats
On an M4 they are part of what the car is worth. This mount bolts to the factory seat mounting points rather than to holes drilled in the floor, so the originals come out intact, go into storage, and go back in at sale time. Put the standard fixings in a bag with them.
The slider
PCI’s S1 slider bolts to the base with four bolts where a conventional slider uses two, which PCI rate as twice as strong as two bolt mounting. When a six point harness is loading the seat rather than a seatbelt, that is the right side of the argument to be on.
Construction
Laser cut and CNC formed from a single piece of 1/8 inch carbon steel, with the bends doing the work that thicker metal would otherwise do. Gloss black powder coat, grade 10.9 8mm hardware, and five and six point sub belt mounting locations built into the mount, which saves fabricating a crotch strap anchor.
Before you order
Tell us the seats you are fitting and tell us about side airbags in the factory seats, because on a car this recent they are fitted and removing one has consequences worth understanding in advance.
Set the seat position before you fix any harness anchor points.














