I don't think there is such a size.... I know back in the day Armstrong made a 37x11.5, it was some weird size, but they don't make anything like that. Anything with a 10.5" width, will probably only be as tall as a 33, like a Baja T/A 33x10.5-15..
I've looked into Goodyear's and I don't think they make one but hopefully I'm wrong. DO you know which model of goodyear they were?
If you see the truck again can you please look into it and get back to me? I'd appreciate it.