I bought a key fob for my wife's 07 convertible, back in June of eBay, and I know that on some items from eBay are buyer beware, finally took the key to a locksmith but before he cut the key he checked the chip with his machine and announced that it had the wrong chip, (63) although the ad said it had an (80) in it. my question is does this all make sense? and what exactly is the proper key chip for 2007 Mustang convertible?