Except for J88, Olds used the same rear drums from 1959-70, if that makes it easier. You may find replacement stock sometimes doesn't look exactly like the OE piece, but as long as it's 5x5 bolt circle and set up for 11" brakes, it will work.
Wagner, Bendix, Raybestos and the other big players in brake components all supplied aftermarket drums if you can't find an original GM part.
Mopar guy on hearing my Hurst/Olds thru Flowmasters.. "TURN THAT DAMN LOUDASS OLDSMOBILE OFF!!"
Last edited by rocketraider; October 12th, 2010 at 10:57 AM.