The bolt pattern is the same for all 8 lugs, but the offset and backspacing my be an issue. If the wheel has an 8" wide rim, then you could squeeze the old tires on, but it wouldn't look that great. If the wheel is any wider than that, then probably not. What tire size you could run also depends on what you want to do with the truck. If you don't mind running a larger tire, you could step it up from your 245x75x16's (about 30.5") and run some 265x75x16's (about 31.5") or possibly some 285x75x16's (about 33") with a little cranking and trimming. If you want something more street-only friendly or somewhat stock sized then go with something like a 265x70x16 (about 30.5") or maybe a 275x70x16 (about 31").