Copper gaskets are only available in 4.290" bore (For up to 676) and in the following thicknesses;
.005", .010", .016", .020", .032", .043", .050", and .063"
Fiber gaskets are available in both 4.140" and 4.290" bore. and in the following thicknesses;
.012", .015", .020", .031", .039", and .047"