Planted Seat Bracket - Polaris Slingshot (2015-2021) - Passenger/Right Rating_SFI 3.4a/5 The larger 4mm hole is

The larger 4mm hole is used with Bell SRV-style shields

and a 17" flexible hose

Whether you’re prepping a concours‑level classic or a period‑race car

padded inserts are added to the inner knees for bump protection

Planted Seat Bracket - Polaris Slingshot (2015-2021) - Passenger/Right Rating_SFI 3.4a/5 The larger 4mm hole isPlanted Seatbase Adapter Brackets are an easy solution for adapting your aftermarket seat to the floor of your specific vehicle. Planted Seat Brackets are constructed from 3 16" thick steel for superior strength. Able to accept sliders from most major seat manufacturers like Bride, Cobra, OMP, Racetech, Recaro, Sparco, Status and more, allowing for easy installation of aftermarket seats in your vehicle. Extra material is also provided for direct seat