I had a 1966 c-20 custom camper that had a original granny 4-speed with reverse lights. I remember the green wire that cowinfog is talking about.My switch went bad, and i could not find a replacement.I know it kind of looked like an oversized glove box light switch.I sold the truck,when gathering all the parts that went with it, i did not find it.You may want to try to get a hold of lilred66 and see if he has one.He is very knowledgable about the 64-66 trucks,possibly may have what you want.
1951 3100 Chevrolet1951 Chevrolet Suburban CarryallImage"A house is built with boards and beams. A home is built with love and dreams."
"Look deep before you leap !!!" / "Everything is Everything"
"If I say a mouse can pull a house, hitch him up"