They were MBI (Midland Brake Inc.) GC36/36 my cost was $146. List cost is $194. (MCI wanted like $600+ for them)That was for the drives. Like I said when I get "Dino" in the shop this afternoon, I will check and see if I can get a part #, size or something! I know they are regular chambers not "Roto" chambers!
Replace them size for size, according to what is supposed to be on the coach.