Welcome.
I've been away and a little late here.
Got some cool cars, I got one too.
Did you post pics and I missed them?
Still need any info on the switch let me know. It does have a flat spring steel retainer that slides around it like side door locks. Those switches are serviceable, at least mine was. The wire connector end comes off and you can clean the brass contacts inside.
I just put in factory power windows, tilt, locks, and an underdash 8 track in mine. Already had factory cruise...and it works.
I'm going for a stock looking resto so no buckets, be a lot more comfortable than that bench though, my second one will have buckets and a 455, along with a poor unfortunate Tiger's tail hanging out of the gas tank.