Model-specific Seat Adapter Brackets
Tillett brackets for side-mounted seats and bottom-mounted seats like the B6 are designed to be mounted to four horizontal holes through the floor pan of your car. You can use Tillett's nylon spacer kits between the bracket and the floor pan to move the mounting locations up such that you create this horizontal plane of four mounting holes.
Unfortunately many road cars have a very oddly shaped floor pan beneath the seats where this becomes very hard to do. Plus, for street cars you often don't want to drill through the floor pan. We therefore recommend the adapter brackets made by Planted Technology. These will mount into the OEM bolt holes for your seats to enable a fully reversible installation without any drilling of the chassis.
Our sister site Level X Motorsports has the full spectrum of adapter brackets available to suit any car.