I have just installed an accessory socket on to my G310R. My UK dealer said that they were not available yet but, they are the same part as fitted to the F800 series. I bought a used F800 one from the UKs main supplier of used BMW parts (Motorworks) for about half price (including postage) of the listed new price. Only problem fitting it was that the nice man who assembled the bike in India had routed the lead in the wrong place - soon sorted however. If you are from the UK, the used part number from Motorworks is: ELN14741 which is suitable for the F650/700/800GS/R twins.