Pontiac Firebird 1967-2002 - Need help finding plastic shift ball for '98 Firebird

This one:
http://i43.tinypic.com/nclhg4.jpg
http://i40.tinypic.com/mw2q2e.jpg

A part number for a new one would be ideal (if available), or a line on a nice used one.

I have a used one. Tiny nick, but very nice $20 plus shipping.

http://i674.photobucket.com/albums/vv107/eseibel67/For%20sale/DSC04297.jpg

This is the exact same knob used in the 4th gen Firebirds. I've gotten a few of them over the years.

http://www.ebay.com/itm/84-88-Fiero-Dark-Gray-4-Speed-5-Speed-Manual-Shift-Knob-NEW-/290686727093?pt=Motors_Car_Truck_Parts_Accessories&fits=Model%3AFirebird&hash=item43ae4773b5&vxp=mtr