Summary: These gaskets are a must, they last long and fit an Allpro head and Zemco headers perfectly. We are constantly changing from short mufflers, no mufflers, Knoxville/WoO muffler headers. These hold up, and don't burn through like the paper gaskets with metal in. We have a set for each header, and the gaskets stay with that set of headers. Just a suggestion. The description says sold in pairs. I purchased 4 'pairs' or 'sets', and I received 4 single gaskets. It's not a bad deal, but the description should say the correct thing, or double the price and give us a 'pair'. I think I like most people change both sides at the same time.
Yes, I recommend this product.