Look at the inner trim peices, 93-96:

http://clearcorners.com/products/toyota/supra8/R_sig/Image01.jpg

97-98:

http://clearcorners.com/products/toyota/supra8/R_sig/Image02.jpg

No, its not the color.. its the actual design of the trim peice.  One sinks in, the other is more flush.

- Mike