The FJ80 ('91-'92) came with 15" alloys, where the FZJ80 ('93-'97) came with 16" ... completely different wheel both 6 on 5.5. The earlier wont work on the later, but the later will work on the earlier trucks (problem is with the rear disk dia. on the FZJ). The '98-Current are the only LCs to ever come with 5 bolt hubs -
BTW: best bet is eBay for those caps ... pricey new.