A-body BB 4 speed / Bell Housing?

I was told A' Housings were different, but I don't know where that comes from. The Chrysler parts book show the same part number for 67-69 A,B,and C as long it is 10 1/2 cast iron #2536945. The difference is the attachment to operate the clutch. There is a company re popping those parts as well. Passon I believe, I have a 2468370 and 372 from the 65-66 B and C, and they would have worked as well. The main thing is the 10 1/2 and cast iron. I have housing part #2636945 in my 69' cuda, and it functions as built.