I see alot of race cars that have been switched over to the aviation grade stuff. Is this a good idea on a street car, or would you guys consider this as overkill? I figure since the rubber ones on my car are 12yrs old it would be smart to replace them before they let me down. Besides, the avi. ones look better, maybe it's ricey though. Where would one look to find such equiptment and how are fitting sizes measured? Let me know what ya think about this subject?