Does anyone know a source for the pivot pins and holdown spring for the rear drum brakes linkage for a 3/4 ton Chevy. One is 3/4" diameter and the other is 3/8" diameter. The 3/8" diameter are on both of the shoe linkage and the 3/4" connects the two. The holddown spring holds the links together. I have searched everywhere. Did find a diagram in the oldcarmanualproject. These brakes have been a battle. I guess 52 was the last year before they went to the dual adjustment Bendix type system.