I just aquired the last two rims out of the five I need for the 52. The rims both had inflated tires with tubes on them. They both held pressure. When I removed the tires and tubes, one had some rust inside, but the other was very rusty. No rust through or anything like that, but flakes of rust. I probed with a screwdriver and tapped the rim with a ball peen hammer, and it seems sound enough. I am thinking that this rim would be ok for the spare, but would like to hear from some of the guys that have been around the trucks for a while. Oh and the truck has stock transmission, engine, and rear end.