Nick, Have you looked at my web site. These are new everything except the outer housing. They are made to fit the delorean, or another PRV6 engine if the engine uses the same mounting bracket. But the De Lorean especially because of the mounting bracket. They are bolt on replacement. Your car will love having the extra power. They are also guarenteed.100% replacement. No exchange needed. The old motorola's won't rebuild to more than 105 amps. John