I have a tank off an 01 gs500f, great condition. Impeccably clean on the inside. There are a few scratches in the clear coat that could easily be buffed out. I only find one dent (pictured) near the gas cap.
Asking $190 shipped, or local pickup for less if you are near Grand Rapids, MI
PICS:
http://imageshack.us/g/1/9903411/
http://gstwins.com/gsboard/index.php?topic=62572.0
They're looking for a 90, this is the different style tank for the wrap around seat.
I always forget those changed before the 04 fairings