The front brake rotor is the SAME part# for all 100 series L/C`s 1998-2005...the only difference I see is the Caliper # and pads are different after 2002...That should not be an issue (as far as slapping a set of the early 16" wheels on yours)....
I would, at all costs, rid yourself of the 18"`s if you plan on doing any serious off-roading, even if you were considering putting a large 18" tire on them...
The 16`s will keep your rims (and outer bead) out of harms way !! (trust me, you should SEE my 18" wheels after a year of hard use..they are trashed, not to mention the valve stems I have ripped totally off in deep sand !!)
I would, at all costs, rid yourself of the 18"`s if you plan on doing any serious off-roading, even if you were considering putting a large 18" tire on them...
The 16`s will keep your rims (and outer bead) out of harms way !! (trust me, you should SEE my 18" wheels after a year of hard use..they are trashed, not to mention the valve stems I have ripped totally off in deep sand !!)