Wills ring are a Machined groove around the bores filled with a stainless steel wire that crushes and seals the cylinder bores for high boost applications. It's still meant to be one of the best ways to keep to seal an engine. As far as iam awhere the gasket bore hole has to be bigger because of the wire so it sits past the wire and only seals oil and water. I don't think the gasket would have the metal o ring around each bore but I might be wrong.

cheers paul