This is a very high quality and very correct Brake shoe eccentric. This is for the M38A1, M170, CJ3B and early CJ5. These are mounted through the backing plate and there are two per backing plate. These work with the 807376 brake shoes or the 9″ brakes with the top and bottom springs. These are not for the early 9″ brakes on the MB, CJ2A, CJ3A, and M38 with the single spring system.