Had some quesrions about a part called "Camshaft Seal", which actually seals between front of the cylinder head and the engine front plate. This seal is rectangular strip of rubber. Picture at right shows the cylinder head upside down with the sealpiece wrapped around another part called "Seal Retainer" (left and right handed parts). When right side up this seal nests into a curved recess in top of the front plate, two places.

This rubber strip seal is item 30 in the illustration at right (click for larger image).
It is 5.5 mm thick, 9.7 mm wide and 140 mm long (0.219-in x 0.382-in x 5.51-in).
Thickness can be compressed about 0.050" when measuring with a caliper.
It seals the joint between front of cylinder head and the engine front plate. It sits in the curved valley where "21" is pointing in the illustration below (2 places). These seals are secured by seal retainers 31 and 32.

See also Part Numbers article AEH404.