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H3s are 16" the old military ones are 16.5. but the h2 were 17. but i thought there was something about the offset that made them not work with out trucks?
The caps that are held on with plastic nuts that thread on the lug nuts would be easiest and they tend to stay on better, as long as your current lug nuts are conical you can go to the parts store and get the externally threaded lug nuts for your truck and they will work just fine.
I finally made it to storage the other day. I looked for my old hub covers and couldn't find them. I think I threw them out. I've been trying to reduce the clutter and those must have gone before the broom. Sorry.