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They come with a rubber band to strap them on the seatpost, but there is also a screw at the back of the light, which I am sure you can use to mount it on a bespoke bracket. I am sure a quick google search will return more info about, maybe through the images.
Also, currently @Thrasher is supposed to collect this at the beginning of the New Year, failing that @mi7rennie expressed interest too.
giofox
@M4xime
Can these be flexibly used either on the seatpost or mudguards?