Apr 2007 I don't think you can assume interchangeability over very many years on the Avanti II, as Avanti Motors tended to buy items like brake components and switches in lots of a few hundred. When it came time to buy, they frequently went to a different supplier. My 74 Avanti II has Jeep CJ brakes on the rear. I believe Jeep used the Dana 44 at that time. I scrounged around and found that the number for the rear wheel cylinder kit is Bendix 66852. The cups are 15/16". Skip Lackie Washington DC