I've been wanting to upgrade my front brakes to cobra calipers, pads rotors, etc. but I've seen a steady price of 300-320 for JUST the calipers. The lowest I've seen is 215 on eBay. I can get refurbished cobra calipers through my work for 45 each. They're made by PBR which if I am to understand correctly, made the OEM calipers.is that the only difference? One says cobra and done Doesnt?