Hello, I got a set for my 1972 Duster from Detroit Muscle. The first one's that I ordered were to thick. The housing would not pull close enough to let it seal correctly. I called and talked to the owner, he was very polite and we both said if the gasket was half the thickness it would work out just fine. He was nice enough to send me 2 - 3 sets out for free and I tryed them all. Not sure what size fitted better, but I bet if you ask him to remember about the guy from Howell Mi he will remember the story... I hope this helps.
