Tillett B7-40 Racing Seat with edges trimmedThe B7 is a lightweight, high specification version of the B6 Screamer. It has the narrowest dimensions of any FIA 8855 1999 homologated seat and at 3. 7 kg also the lightest available to the best of Tilletts knowledge. This is the B7 40 which has a maximum width of 40 cm. This narrower 40 cm version is for cars where there are fitment issues and a narrower seat is necessary. The two models are otherwise the same size internally and are both