Tillett STBI Aluminium Side Mount Seat Bracket Set - Suits Tillett B6/B7/B8/B9/B10/C1 SeatsCAR SEAT BRACKET SET. MADE FOR TILLETT SEATS B6*, B7, B8, B9 B10 & C1. The STBi bracket system is designed to tuck under the seat to give a minimum footprint, this aids fitment into narrow and restricted cockpits. The STBi brackets are made from 5mm thick black powder coated aluminium, with a revised edge profile which helps avoid the leg bulge. The brackets allow the seat to be tipped, raised and lowered using the various hole and slot combinations.