This is inspiring. I got a Model M terminal, 1395162, made in 1995, mainly for the ANSI key caps. Now, the board is so nice, I was thinking to use it. It looks and feels exactly as my SSK. It has a RJ45 connector and I don't know the pinout yet.
The place were I found it has a box with 20+ IBM terminals, all Model M. I was looking for a Model F, after being seduced by the F AT I found a few days before. This is how I got it.
PS. And it was free. The guys in this shop recycle computers, but they don't care about keyboards.