Are the drums the same between 66-68? I can buy a bunch of parts from a local guy and he has the parts listed as 66-67. I know some will be useable on my 68 but i really am hoping the drums are so i can get them machined and use them for my car since mine are out of round.
As far as I know, the front drums are all the same between 64-67 Wildcat and Electra, LeSabre was different, but used the same one from 64-70, and the A-body stuff is similar to the Chevelles of the day. Rear drums on all fullsize cars should be the same. 1968 -1970 senior series cars (your 68 Riv included) used a slightly different drum than the 64-67 series. I think the difference was only in the hub size and bearing size, but I'm not 100% sure.
