only 95+ LS400/430 wheels are interchangeable due to the massive front brakes on the 95-00 LS400 and all LS430s. any 89-94 LS wheels will NOT fit.
IS, SC and RX wheels will not fit at all, neither will 1st or 2nd gen GS wheels (up until 2006). 3GS (06+) wheels will fit DEPENDING on year, size (generally only the 18" wheels) and if they came off of a 430/460 or a sport packaged 350.