davidsilverspares.co.uk can get this one listed for the MC21/28

Part No 55110-KV3-830

Price£4.52 + postage & vat

I think the R5K is listed as part number 55110-KV3-000 but you will need to check with davidsilverspares.

Reub.
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92 MC21 NSR250SE / 09 ZZR1400
I live more in 5 minutes of riding my motorcycle than some people live in their whole lifetime!