I have not put the lighter but I have seen this in my friend's bike. Basically it is depends on the bike and the mechanic that how he put the socket and the lighter in the bike. So you can set that to the mechanic and I am sure your problem will be solved.
Mike, I put a double socket right on the right front side of the frame just above the radiator and it worked fine for awhile but they both went out so I pulled them. Have to find another one but having trouble locating one. Even Walmart did have one. But I'll look for it.