Into Gear's premium range of motorcycle battery maintaining and charging units come from the best in the business, Optimate. 
This DIN socket allows you to create your own accessory socket. It plugs directly to your Optimate's SAE power lead and can be permrenently fitted to a fairing panel etc by drilling a 16mm hole.
Tech stuff:
18AWG / 0.82mm 5A / 7A Max Cable 
Thicker SPT-2W Insulation
DIN Plug-SAE Connection