1960's 727 trans verses 1980's 727 trans

OK so I picked up a 1976 727 small block trans part#3898864 which tells me that it came out of a 1976 Dodge Truck 150,250,350. The guy that I bought it from said it came off of a 360 from a little red express truck. The only thing that I can see that I am going to need for it is a different tail shaft because there are no humps to mount the floor shifter bracket to, it has the long tail shaft. Is there anybody out there that has the tail shaft that I need? The guy that I bought it from says he has a few more 727's around and that he would check to see if any of them had the tail shaft I am looking for, but just in case he does not it would be good to know that someone else does.
Bob