[hammermouse]

Thanks all.

That proves that it should be 4 wire, not 5. GMCPauls only has a Chevy one for sale (says it won't fit a GMC).
From researching Chevy switches, it 'appears' I need a GM 1116607, Delco D1432 switch (that's the old number and may just be a Chevy only one). I found several NOS of this part and they are in fact 4 wire, but the spade connections are turned different that DPowers picture (which leads me to believe that yes, it's a chevy specific part and won't fit GMC without modification). Not as much an issue since mine doesn't have the socket and I just need to add spade connections. But, I'll take a chance and give it a try.

For the bezel, I found a 61 chevy bezel that appears to be correct. So I'll take a chance there too.

Not very cut and dry for some pieces... O.o