What specifically are you looking for? The 5 uses a tow hook on the front. Many other cars do as well (I know Porsche 928's do). But these are usually threaded and meant to be removable - Not sure how SCCA or other racing orgs feel about removable tow hooks.
If you're looking for a "racing" tow hook, you might try Summit Racing. They may have one you can bolt to the frame/bumper. HTH
