Hello All,
I pulled this stuff out of my 1978 GMC C15. If you're interested and and can make it work, you can have it. Pickup only...I'm in the Goodyear/Buckeye area.
It seems to be dealer add on, within dash Air Conditioning. It didn't work when I pulled it out. I would have tried to repair, but I have bigger issues with the truck to fix.
p.s. the spare tire rack not included.