You might be able to find something through them but I don't see why they or anyone else would release detailed machinist prints on those.
I guess that is true, but from what I have read, they are a standard size, no? There wouldn't really be any intellectual property in that case, would there?
A print like that would work, I can figure out the groove radii, that is not that critical as long as the gasket will seal. I am sure they are small.