There were two interior upgrades available for the Boss 351, you could get the Mach 1 Sports Interior or the Decor Group. The Decor group offered the Boss buyer either comfortweave knitted vinyl, or the Upbeat striped cloth. The both were sewn in the same pattern as the cloth Grande' seats, while the Upbeat cloth didn't have the bright metal medallions. There are some great pics on the 429 Megasite