I have the conversion kit and bought one of the black and chrome wheels but it's my understanding that with the kit you can us any wheel from 1968-1975 and 1977-1982 since the bolt patterns are the same 6 bolt set up. Most guys don't want the larger early 70's wheels because they are larger, my guess is they might a bit larger too and find those wheels more difficult to fit behind and use, just a guess.