There has never been a recall on the rear view mirror, but only the TSB. Not every GS has this issue and your GS was already out of warranty when you bought it. Most likely Lexus may not cover it and they should not have to IMHO. If the dealer does, great! Like mentioned, try ebay.

 

I tried ebay with no luck. I only found ones for the 2IS. Do you know if these would fit the gs or if any other lexus has the same mirror?