yea, 99 and up are 16's and really hard to fit 15's on. only 1 person I know of on here did it and I think he needed wheel spacers and had to shave down the brake caliper because where the wheel sits against the brake rotor is only about an 8th of an inch beyond the part that the caliper grips... I don't think just any 16 that's the same offset and 5 on 5.5 bolt pattern fits a GV either because of the wierdness there... I do believe the non-grand vitaras that are 2nd gen have an offset that sits closer to the vehicle and more than likely smaller brake calipers
but yea, you can probably fit any suzuki rim on a 1st gen kick/vitara/escudo/tracker
man these things have allot of names