it is not a motorcycle part it is a circlip nothing special about it
i googled this in 3 seconds
http://www.acurapartswarehouse.com/oem/acura~circlip~48mm~94521-48000.html
Have you tried calling your local Honda dealership? They likely have the current part number for this as it's more than likely used in a number of different bikes etc. and the part number has likely been superseded by a new one.
Nothing unique about a 48mm circlip - they'd be used in all manner of application.
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