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This is the oil filler cap O-ring called out on page 37 in the IO-390-C Series Engine Illustrated Parts Catalog as O-RING, Oil level gage.
This gasket is about 1.125”inside diameter. Fits my IO360. 74068 is smaller. ID about 1.0” diameter. Fit my friend’s O320
74065 Lycoming Oil Level Gage Seal Ring
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Lycoming does not show a MS cross ref for this part.
Inside diameter 1.103 | cross section .135