This is a rear drive filler cap. This OEM Honda cap is a direct replacement for the original cap found on the rear differential. It will fit all Goldwing GL1000's, GL1100's, GL1200's, GL1500's, GL1800's and F6B's from 1975-2017. This is available either with or without a new OEM O-ring. Please make your selection when ordering. 12361-300-000, 12361-300-000A
