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As B+M seem to make less shiny/poncey versions of the the stuff they make for SON, it seems likely this will fit like the SON one. The bottom of it has a curve and fixing designed to mount on the guard, at about 10 oclock if you’re facing the wheel on the drive side.
Perhaps the lower bit of housing (which is different from the SON one) has a fixing too, but the SON one requires two holes, 4 or 5mm iirc. One centred for a bolt to fix it, the other to one side is to route a cable through and along the inside of the guard.
Does anyone know how this light should look on a Velo Orange Mudguard? Can't find a manual or how it would fit on.