Would you mind sharing details - I'm looking for a bumper for my GV.
To answer your question - as far as I know the front end of the frames are identical, so the bumper should bolt up just fine - there are differences in other areas, but these are going to affect appearance rather than function - for example a bumper for a Tracker will have a recessed section in the middle of the top because the lower edge of the grille is not flat, the bottom of the GV grille is flat (at least mine is), so you may end up with an unsightly gap in that area.
When you bring the XL-7 into the picture you'll have to be more specific - the early (01~03) XL-7s were, from the front, visually indistinguishable from the GVs, but later models (04~06) had different lights & grille