Extension, oil filler nh8 (dark gray): next higher assembly is a cylinder block. This item is part of an outboard engine, model number bf130ax. The information came from a honda power equipment parts catalog, first edition, august 2001. Slidell marine, inc. (cage 08ys9), mentioned that the parts on this engine are manufactured at several locations.
NSN 6650-01-462-0474
NSN 6320-01-201-2776
NSN 5985-00-945-4953
NSN 5998-00-342-6044
NSN 4140-01-540-5318
NSN 6110-00-686-1530
NSN 6320-01-643-0850
NSN 4140-00-174-6287
NSN 6130-01-233-8882
NSN 5905-00-557-4438
NSN 5935-01-287-4419
NSN 6105-00-022-7806