Currently got this one on my work laptop. Model M terminal board with internal converter. The only layout changes I made versus a normal 102-key are that RCtrl is is a Windows key, and the four keys along the right side of the numpad are =, -, +, and the normal Enter.
They’re proper replacements. Unicomp, which still makes full size and TKL Model M’s, sells replacement keytops.
I got this “Display Station” terminal board for cheap on eBay because it was a later model, a little bit dirty, RJ-45 instead of PS/2, no indicator LEDs, and missing 4 keytops. It’s still a buckling spring beast, though. Someday it might need a bolt mod, but for now it’s only lost a few of the plastic rivets and still works perfectly.