Hy Dhalldens, the wheels that were on your truck when it left the factory were Kelsey type three piece wheels, at least that was what was on the truck when it left a Canadian factory. Your wheels have a ten stud mount on an 8 3/4" bolt circle, there should be lots of those wheels available in big truck wrecking yards. There were two basic widths 6" and 6 1/2" and two different offsets 5.53" and 6.0", these wheels were available on C,L,and S 50 and 60 model standard duty trucks. Tubeless wheels were also available for those same trucks, I can provide part numbers if you require them. If you are going to do anything with those wheels I would strongly advise you to remove the valve core from the tube and let the tire deflate completely before you do anything with the wheel itself, good luck.
