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I put these into a 1994 Firebird and they fit fine. But the last one I put in shattered into several pieces on the ceramic part when I was torquing it down to the proper ft/lbs. Since I have done this a lot and none of the other ones broke, I assume it was a defective one with a hairline crack or something that got past QA. If they even have QA. Great for the price but watch out when installing them.