500 600 650 Domni head gaskets

Are the 500 600 and 650 Domni head gaskets all the same? What about spigot or flat top cylinders? What's the bore size of the gasket? Are the spigot and flat top gaskets different?
 
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The spigoted 500 600 and 650 Domi head gaskets are all the same. Bore is 2 13/16 inch. Don't know about the flat face type.
 
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