What the extra bracket in a Sparco sub-frame box is for, where it goes in the fitting stack, and the thread mismatch we found on the Mini R56 frame.
Fitting brackets
Everything that goes between your seat and the floor. Subframes, side mounts, sliding runners and the bolt patterns that decide which of them you need. Most of the fitting problems we get on the phone come down to the bracket and not the seat, so this is the section to read before you order either.
Customer Car: Porsche 997 Fitted With OMP RT Seats
July 2025: a customer’s Porsche 997 fitted with OMP RT seats on Endurance multi-point side mounts and Planted Technology frames, keeping the factory belts.
Which Bucket Seats Will Fit My Fiesta ST150?
Which bucket seats fit a Ford Fiesta ST150, from XL fibreglass shells to steel frame seats, and the Cobra and OMP sub-frames that bolt them in.
Definitive Guide to Corbeau Bucket Seat M10 Bolt Fittings and Side Mounts
Corbeau side mounted bucket seats use M10 fixings, not M8. Which seats that covers, which side mounts to use, why not to drill out M8 mounts, and how the install goes together.
Customer Question: What Size Bolts Do Bucket Seats and Brackets Require?
What size bolts do bucket seats and brackets use? M8 for nearly everything, with Corbeau’s side mounted buckets on M10. Every joint in a seat install explained.
