Distributor outer cap gaskets on dome distributors

[JM 35 Sedan]

Originally Posted by Brian

No need to cut /trim anything. The gasket fits on the spigot on the outside edge of the inner cap, the outer cap goes on the other side of the gasket; the protrusion in middle of outer cap fits through the hole in centre of inner cap and a rubber o ring is inserted onto the groove on that protrusion, which holds the whole assembly together.

Exactly Brian, you nailed it. I've never had to trim any of those end cap gaskets that are included in any distributor gasket sets, or included in complete engine gasket sets from Best Gasket Co. or other well known gasket companies.