[redmodelt]

Looks like the setup in the photos uses the standard exhaust to header doughnut type gasket. If you are mounting yours different, you may have to do some searching or make your own. Better auto parts stores carry material that you can fab one up. do an on line search with the inside and out side diameters you need. If nothing else this might help with what cars they fit so you can ask for them at the parts counter. Or contact the dealer you bought it from.