The car with the MUTS relay on the board is not a TAC20, it’s a TAC20-03. The suppressor issue applies to the TAC20 and TAC22 only. The plug in suppressors were all supposed to have been replaced with the wires in ones mentioned earlier. I’ll cut one open and see what’s inside it this weekend.
And you should be able to get a Siemens Logic board from anywhere that sells Siemens starters.