Matt, Corbeau seats and most like them will not be FIA approved. My aluminum seat is not FIA approved either, the only ones you will typically find like that are "Cobra" seats and the like.
My understanding when I looked into a seat is the FIA cannot approve a metal framed style seat like ones that come in most street cars as they are designed to work differently in a crash than race type seat. So, just because they aren't FIA approved doesn't mean they aren't safe, unless your going for a type of legit racing that requires this type of seat.