On mine I went to Auto Zone and picked up a set of LED trailer lights and used a trailer connetor wired to bike so it's easy to disconnet when I pull the Tow-Pak off for sevice.
These are about 4" in diameter and work great for me.
LED'S will have minimal drain. The 650 has seperate turn and stop ights so if want it all you'll need to pick up an adapter while you are there.
Good luck...Sonny