Chris,
First off, welcome to IT.com. You'll find a thread in one of the other forums about seats. Personally, I like the aluminum Butler Road Race seat. Beautiful, strong, and well made. On the downside, it's $550 or more, depending on where you buy it. It's also probably not as light as some of the composite seats, and since it's not FIA approved, it will require a rear brace.
Converting that car to an IT racer???
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MARRS #25 ITB Rabbit GTI