No need to worry about the stud holes. The correct wheels for the fitment to your truck will be the '87 and older 1/2 ton 4x4, which uses the same 7/16s studs. The newer ('88-'07) trucks use the same pattern, but the offset is far too deep for correct fitment, they also use 14mm wheel studs. As far as the stud situation, if you have the correct fit wheels and the holes are oversize, no spacer or filler peice is needed. You just need to have the correct lug nut that will seat properly to the wheel. You may have to go to a larger hex size nut to seat correctly (13/16 instead of 3/4). Those are readily available from any place that sells aftermarket custom wheels.
ps, you could also swap to a 1/2" stud. I did that on mine. Napa can cross reference the stud knurl from the original 7/16" to a 1/2" stud, no machining required.
