Spproximate width 8", use bayonet cap and 13/16" fuel valve These solid mount Fat Bob style gas tanks are available with the early bayonet style gas cap opening or the late screw-in style opening. all stock and aftermarket products sold for Fat Bob gas tanks will fit, and these tanks have one 13/16" external thread fuel valve connection. gas tanks are unpainted Replaces OEM# 61219-83, 61425-83 Fits: 1936-1984 Harley Big Twin 4-Speed models
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