I know about V8s, not the Model As, so I did a little reading. All of the adapter suppliers also have clutch plates and you can use the original flywheel, etc. So, now my question is what are you trying to do? If you just want a clutch plate that will work contact any of the suppliers, in your case Macs would be were I would start (as Bassman posted). Or are you looking for a clutch out of something else that will work in your application?