http://www.tacreationsusa.com/93-02_firebird.htm
they are located in miami but will ship nationwide. when a body shop damaged my drivers side skirt back in the spring of 05 while trying to take it off to paint it (without taking off the 2 bolts that hold it to the fender

) i went down there and picked up a used skirt which i made them pay for. It was (and according to the site still is) $100
I am referring to the "side skirt" ground effects piece for trans ams.. if you're referring to the metal rocker panel itself they might have that as well but what i bought was the fiberglass ground effects piece
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1995 Black TA A4 LT1
Mods: MSD cap and rotor, MSD wires, NGK plugs, K&N filter, 17" corvette GS replica's, Ram Air and OEM WS6 hood