So I'm getting my 904 Transmission rebuilt that came from a 1974 Plymouth Roadrunner 318. The problem is I can't seem to find the correct size of reverse/low band, the used one is currently bigger than what I'm used to seeing in other 904's, can someone pinpoint me in the right direction of where I can get the correct band? This transmission is going behind a 318 Magnum in my 1965 Plymouth Barracuda.