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 5925-00-492-7905
NSN 6240-01-160-8499
NSN 5925-01-634-0664
NSN 6105-00-060-7024
NSN 5935-00-910-3855
NSN 6685-01-062-8104
NSN 5999-01-445-5728
NSN 5960-01-248-4743
NSN 5985-01-524-3898
NSN 5910-00-172-9804
NSN 4140-00-575-5106
NSN 5985-00-930-1092