Hi Bill and welcome,
I'm not sure if Clarity's have a grounded connection. Which ever it is you could start with a basic cord that a female end to attach to the speakers. If it is grounded it would be a C15 110 volt power cord. I am not sure what the designation for a non grounded cord is.
This is the same type of cord that a computer, printer or other common electrical appliances have on them. If you have any of those I would try them to be sure the speakers work properly before you invest more money.
You could purchase them at office supply or Radio Shack. Just check the amperage of the speaker and get an inexpensive cord to check out the speakers.
You could also purchase the correct cord caps and a piece o wire and build your own. I think a basic cord with molded ends will be cheaper though.
Good luck.