1971-72 GM A-body Prop. Valve Bracket. 1pc Also 68-70 Disc Brake Conversion. This is the bracket for disc brake cars. holds the Prop. Valve in the right location to the frame. All cars being converted to disc brakes must have this bracket for proper valve location and mounting. No disc brake company provides this bracket in the kit. These are very difficult to find, and this is exact to NOS in every detail. This bracket will also work great for 64-70 A-bodies being converted to disc brakes. This mounts the valve on the frame in the right location. These are the details that separate the first place trucks from the rest.