pump and pulley question

the 68 B-cuda 318 that I had here had some other pump on it, TRW? Federal? I don't know but I can say it didn't line up right either. I can also say that the OEM Saginaw pump lines up perfectly attached to the cast iron water pump. The only downfall to this pump is the OEM cap that Chry' applications had. This cap has measure stick and just 2 little finger bump outs on its rim. Ebay sellers want like 40 bucks for that cap. The concourse restorer might pay that. Any/every Saginaw reservoir cap will fit. Aftermarket is loaded with options like chromed caps too. Not all found in search will have GM logos.