On the Chevys I've only run into a couple of variations which seems to agree with Shee Mar parts list. The placement of the mounting screws and the wiring. The six wires is correct for a Chevy, any ways. I just double checked Shee Mars listing and see that the SM197 is used on all of our GMCs, and only the 63 Chevy, so I'm kind of curious about the mod now. Keeps us updated.

Larry

I don't own a vehicle that isn't old enough to drink.