found a master cylinder on e bay, looks exactally like the one on my truck, but I cannot cross refrance the part # to my application,neither can the seller just says 1970-1973 chevy and 1967-78 gmc truck. I have a ( 1970 C50 truck ) Can any one help? here are the part #'s listed in ebay- ac delco 18m52,carquest E150193,napa 36467,bendix 11618,wagner f77034. It has been called the dog bone type, and is a 1-3/4 bore. Will it fit my 1970 C50 dump???