I had a 93 ls400, came with 15 in rims. Put 16 in oems on it. Now have a 2000 ls400. bolt pattern same, but the rotors don't clear rims.
I sold an extra set of 16 in on ebay, and someone sounding knowledgeable said the 16's that fit a 93 would go up to a 95 or 96, i'm not sure.
I still have a set of 16in rims, good condition, that i am going to put on ebay. They have Toyo Proxes TPT 225/60/16 tires with marginal life on them (wear bars starting to show on 2 of them and not far from it on the better 2). $400 plus shipping.