I have 2 headlight switches, one has 175 and the other has 173 on it. Can't say which one was originally on the car, which is a non-RS with factory console gauges. Research here indicates that 1995173 is correct for this application, but the AIM doesn't appear to call up this with RPO U17. The AIM does however specify different part numbers for console/non-console RS cars under RPO Z22. The earliest documentation I could find 1995173 in is the 1972 P&A catalog.
I'm going to use the 173 switch, based on research and advice here, but can anyone confirm if it is an assembly line correct part #?