Hi Simon
The 3313 flasher that you are searching has this oem code (38301-KV3-701) ,
which has superseded from Honda with this code (38301-mr7-004) with 3314 code on it.
So do a search on Google with this code (38301-mr7-004) and you will find it very easy.
cheers
Stefanos
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Owner of : Honda NSR250 MC28 95sp colours / Honda NSR250 MC18 R6K SP / Honda RS250 NF5 89 in boxes / Honda C50 12V cub / Honda C50 12V super cub Japanese version /Yamaha XT600 89 benetton