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Are you looking for used parts ("Parts Wanted" - the forum you posted in), or are you more interested in leads on new parts?
I have a Corbeau Forza, and while I'm basically a "straight line" racer, the seat is very supportive laterally as well. Entry level, reasonable price, excellent build quality (when I bought it, it was FIA certified - not sure if it still is), and Corbeau makes a slider mounting bracket specifically for the 4th Gen F-Body, which makes for an easy install. Available in two widths. And it is decent for extended driving on public roads.