904 differences

thanks Fishy , the race rebuild kit I bought for my 904 is sold as a 72 and up kit , I bought the billet drum and 24 spring return module kit as well so that all works fine but I was wondering about the seals and bushings as the new stuff naturally looks a little different from whats in it . I'm just trying to do as much as possible before I do the swap and would hate to put a wrong seal in it and have to pull it back out and redo it .
PS I'm not even positive it's the origional tranny but if it is it's in a 69 so should be a 68 part I believe