I ended up ordering one from Lofgren ($99). My car isn't fast enough to need one that is SFI-approved, so I decided to save myself a few dollars. From what I've read, they fit great.

"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson