Kirban often has used ones for sale. Try him. I sold a NOS one a few years ago. The switch was originally made by Singer. Check the pin count on the back. I remember some cars are different.
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The seller of the switch in the eBay ad is wrong.
That switch did not come out of an 84-87 Regal. The bezel is wrong.
The switch will definitely not work on an 86. As Hotfoot said, 86 used a 7 pin switch.
That one appears to have 8.
GM had a lot of configurations of their p/seat switches. It's possible it wouldn't work on an 87 either.
Got this one years ago and found out my was a 8 pin. It has a crack in the chrome mount but if you have buckets you won’t see it or pop out the switch and use your mount