Years ago, I got a rearview mirror from the junk yard that has the map lights on it.  It attaches to the windshield, like most rearview mirrors.  I used the wires inside the stock mirror cover to power the new mirror.  And, a little wire loom covered the wires up into the mirror cover. 

 on a related subject, now that I have a 91 I want to convert the seatbelt
lights to map lights. Is there a writeup of the procedure anywhere out
there?

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