Thanks to all. ( I also received 2 emails w/ pix from a couple of well respected bolters. OK , well respected by me anyway

) The single masters are only available as NOS-maybe or rebuilt only-with exchange up front. I'm staying original-ish but I would like to do this. The original shoes with asbestos are still in fine shape!
I stopped by tthe junkyard today and looked at a lot of setups. 41-46 have a LOT of similarities with 47-50 AD's but not as far as MC's go.
It seems the mustang MC is preferred. Any reason why?