What nobody seems to understand is my supplier tried to get speed pro to fix the problem and they told him no single rings are avialable not even a single cylinder set. And as for just opening another set this are 4.500 +.005 rings he had to order the first set. I just don't understand how anyone can think this is a good way to run a business or expect the guy with a small machine shop/speed shop to suck up speed pros lack of service. When he sold me the rings he made a whole $13.00 on them. All I did was call speed pro after he told me they won't help and I got the same thing from them as he did. No satisfaction.