Is this what you are looking for?
Plug - Male - 2-Pin* - *DC Connectors & Plugs* - *Electrical* - *Downwind Marine Inc
I have a couple of similar 2 pin female conectors on my boat and was able to buy the male screw on connectors down island but not here in the states. This site has a bunch of similar connectors so check out the whole category page if this is not what you need.
