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Metal washer, Oring, gasket and cover. If you fill the oring is not sealing enough add another metal washer.
I think we determined that the /6 does not have the metal washer and $2000 o-ring stack up. The filter is sealed with a separate nut/washer when you take the flat-sided cover off. About the only thing the cover needs is the gasket to prevent oil from leaking to the outside.
Anton covers it all here: http://www.largiader.com/tech/filters/
The OP was asking about both.