I have two 6x9 speakers from my 2002 SC430. These were in the doors and I have replaced them with different speakers.
One of the speakers is in perfect condition and one of them has separated where the foam meets the cone. There are several threads on Clublexus that describe how to repair a speaker in this state. It is an easy fix.
First $16 (cost of shipping via USPS) can have both speakers and the rings.
If you are in LA and can pick them up you can have them for FREE!