The Vacuum Power Brake Booster 54-71061 is a steel-made brake booster designed to fit various GMC, Chevrolet, Oldsmobile, and Isuzu vehicles from 1995 to 1998. This OEM part includes the booster and an instruction sheet, with a housing diameter of 10.812 inches and a diaphragm diameter of 10.40 inches. It comes with a 5-year manufacturer warranty and is not considered a vintage part or a performance part. The booster is specifically designed for the mentioned vehicle models and has a stud thread size of M10x1.5.