Narrow body spoilers:
All the vendors sell a copy of the GTS spoiler, they're available in fiberglass, plastic (Pantera Performance Center) and steel (PI Motorsports).
Hall has a GT5 spoiler in fiberglass, Pantera Parts Connection has a GT5 spoiler in plastic.
Amerisport has a "mini-spoiler" in fiberglass. That's what's on the front of 6018.
Pantera Performance Center has a flat air dam, you'll find one mounted on Larry Finch's Pantera.
The Revson spoiler is no longer available.
Gran Turismo also sold an elaborate urethane spoiler for the "L" models, it can be seen in the picture below. Although designed for the Panteras with the L bumper, as seen in this example it can be used with Pre-L Panteras too. Its no longer available.
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