Ok - Learning & knowledge is the key here.... I will get the measurements & pics by this weekend.....Based on the pics I sent, I am 99% certain the rear axle assy. & the inner of the dual wheels are original to the truck....so the challenge is to find a 16" wheel that has the exact center hub measurement, leaving the lug hole diameter as basically a non issue, which I'm good with that....I really want to keep 16" wheels and avoid going to a 18 or 19" wheel... I am also certain that the later outer wheel in the second pic I sent, came off a mid eighties C30 as I took them off the truck myself.....Now another question....On the front of this mid eighties truck, there was a plate bolted on the outside of the wheel, which I believe to be a factory application....just wondering what that's all about...I will send a pic of that as well....I truly appreciate your time & effort on this.....Thank You.....