View attachment 10699 I would say 3/4 x 3/8. I had slowriderz make me one for my 53 Colson looptail, it has a shim in it as well. probably the same thing 13/16 x 3/4 shim.
I have not, but I was looking at his post last night and that's the route Im probably going to take. I'll take some measurements just to double check.I don't know if you've had Chad "slowriderz" make you a post, but I highly recommend one. He's sharp, he'll make you whatever you need or want. And I'm glad to be of help to you.