Cinnabar Pearl

What is the correct original factory delivered spare tire ( and wheel ) size(s) for a 1999 GS400? Was there a difference in factory delivered spare tire & wheel size(s) for a '99 GS400 that came from the factory with 16 inch wheels vs a car that came with 17 inch wheels? How can you tell if your '99 GS400 was factory delivered with 16 inch or 17 inch wheels? Is there a "build sheet" somewhere in the car, that can tell you? ... or ... does the Lexus dealer have access to that information in their data base(s)?