From:Doug Miller
Subject:RE: maybe these are 51 fork tube caps Date:Sun Dec 16 13:06:54 2012
Response to:18056

The parts may be searched on his site under "hummer" though harley is in the title they arn't found by search under harley. they seem to be listed in the suzuki section.
On E-bay, "230888005413" . This seller doesn't know what these parts are and admits it. They are listed as 55-59 parts but aren't to the best of my knowledge.