This is a brand new 1968 - 1976 Corvette Power Brake Booster Made by Corvette Stainless Steel Brakes! Highest quality factory original reproduction available - 100% CORRECT! Correct GM 338906. Bendix 2510842 Correct factory black plating. Correct OE style check valve. Correct adjustable 5/16 hex pin. Correct 3/8 x 16 master cylinder studs with nuts. Correct original "weep" groove. Why pay to rebuild an old unit when you can have the real deal for a great price?   Our decades of excellent customer service on Ebay shows in our Feedback. Please contact us if there is a problem and we will do our best to make it right.