I will say Randy that most after market rims never match the stock specifications. Look at any Tacoma/4runner/pathfinder/jeep wrangler/grand cherokee with after market wheels. No really, LOOK! They always stick out more so they can fit a bigger tire, usually with a lift. If you look at the link Scott provided on offset, you will see that most stock cars and trucks have a positive offset. I know my Toyota Tacoma did.
As for different offset and backspacing i would say almost everyone with an aftermarket wheel on this board does not have them matched to stock spec either. The only complaint i could think when i had my american racing rims on was steering, which was fixed after i got an alignment done. If you are really worried ask some of members what they think of their rims. If they have had any problems, etc. I can't think of any threads where aftermarket rims have been a problem (except trying to fit a bigger tire). I can understand your concern but i think you are just worring a little too much. The effects are most likely minimal. But if you want something to fit exactly find someone willing to part with 16" 1999 VX wheels. I think that is the only thing that will match exactly. I am sure there are many members here who don't use them anymore and could sell them to you.
PS
The VX is basically a 2door trooper. Same frame, enigne, and underside. You can look at any rims made for the Isuzu Trooper and they will fit.
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