deathvalleydog,
I also have a 1950 Chevy 3800, the 9' beds are great. On mine, the spare tire is mounted below the bed in the back. It has two straps that are channel shaped (in cross section) These hang from four 1/2" diameter eyebolts that are fastened to the frame members. The Factory Assembly Manual shows what I'm trying to describe but on the 1.5 ton trucks. But every 1 ton I have ever seen has the same setup as I described for my truck. I think around 52 or 53 they offered a side mount spare for these 9' beds. I do have the correct parts for mine (currently off of the truck). It's a little difficult changing tires on these 1 tons just due to the weight of them.
Good luck with your truck!
Tom
