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So, on a hunch, I pulled the window switch out of our 91 Chevy Truck. Turns out, it's the SAME switch used in the vette! Except, IMHO it looks a little better, because it's totally flush with the dash, and it's chrome. $5 switch from AutoZone. Damnit, and I already ordered my new switch from Mid-America, guess it goes back.
So, for anyone with either a broke lock switch or window switch with an 86-89, just go get a common GM switch from AutoZone.