Hi Colin
My name is Valentine I live in Red Deer. I own a45 GMC CC-102.Have done original.It came from Boise Idaho. If you look on the right side of frame, at the front you should see the vin #. As for the box bed it is metal,, tailgate has old GMC on it on circle around was on earlier years.There is also a guy that has a 41 GMC outside Sylvan Lake, that I sold my gas tank to. If you have any other questions? Now that I know you are rodding it do oyou want to part with your rims as I'm in need of two or three. If so do you know what the bead width is 4" or 5".