From what I have been able to figure out it appears that the Ford T and A sleeve fits a.starter with 1/2" shaft. Of course ours is 5/8". I don't know if this is true for all the Ford T and A starters. I will hopefully know much more.once I get the Bendix catalog in hand. I have a complete Bendix drive for a Ford T, it looks identical in every aspect except it is for a 1/2" shaft. I tried to bore it, but it is to hard to do so.
As I told the wife, I love having a Durant, but a Ford model A would be so much easier, however being the oddball at the car show is more fun. LOL
After much searching, I have finally come up with a replacement starter drive for the Autolite MZ-4012 starter on the Continental 14L engine. It is an Accurate Starter Drive part number 3-121C.