I'm new to the forum and I'm hoping for some help. I have a 1986 C-20 single cab with a service bed on the back. My dad bought the truck new and used it for work for a number of years. I've inherited the truck and I'm looking at changing the service bed to a regular style bed. My question is what body years will match up to the '86s body lines for the bed. Does it have to be from 86 or what years will also work. Thank ya'll.