Again, it depends on when. I also had the 37" radial tires as in the kit on mine in '03.
The older bias-ply tires were 36" x 12.50" 16.5 and the newer radials are 37" x 12.50" 16.5 R tires. The radial tires came out in the early '90s. The older bias-ply 36" tires were still available as of about '07 when I was at the NTC. We had a roving maintenance team that came to you like a pit crew and changed flat tires. There were a lot of tires punctured or cut by the rough terrain there. When you called them on the radio to come fix your tire, you had to tell them which size you had to make sure they had the right one on their truck.