9 1/2" Rear Drum Brake Backing Plate Bolt in Stud- one for each side. 2pc set. Replacement for: 1964-72 A-body, , , , 1967-69 F-body, , 1968-74 X-body, , , , 1970-81 F-body, , 1973-77 A-body, , , , 1964-72 Elcamino, 73-77 Elcamino 1970-72 , 69-72 All other GM Cars with 9 1/2" rear drum brakes. This is a 2 pc set that includes the Stud, Lock Washer and Nut. This bolts into the backing plate and is what the springs attach too. These are sometimes a big rivet but on most and all products is this stud. They were used on both the 10 and 12 bolt rear ends and was considered the 9 1/2" GM Brakes. These were used on all the mid size A, F & X-Body cars. The full size cars usually had the bigger 11" brakes so this kit is not for the 11" big brake cars.