This listing is for a set of 4 windage tray studs for big block Chevy engines, including 396, 427, and 454 models. These studs are designed to fit various GM part numbers, including 3902885, and are compatible with a range of vehicles, such as Corvette inboard crankshaft bearing cap, LS6, L78, L88, L89, and ZL1. Made by GM, these studs are top quality and built to last. Thanks #40