I have a friend who is getting rid of Buick stuff. He has a set of 1958 -? aluminum drums. He says these have the ball bearings ,studs are marked with an F [front ,because of length?]. They appear to never have been turned. Measure 12" $150 ea plus shpg. He also has a bunch of 65=66 aluminum drums, $100 ea plus shpg. I saw no broken fins on the 58s, and he says that all of them are good. I will post a pic of the one he brought to me if there is any interest.