You have to be more specific about what Miller you are talking about. All the newer ones are the same DINSE connectors as Everlast, but Miller often has the gas through DINSE where the argon runs through a hole in the middle. Your LWS should have an adapter for that. If your Miller is an older model it could have any number of different connectors, as that could be specified when purchased. Need a picture or just take it in to your local shop to figure out what you need.
Torches usually come with plain threaded ends, and a bunch of adapters are offered to mate with various machines.
You can find all the bits and bobs at the tech torch homepage.
http://www.tectorch.com
Specifically the DINSE stuff is HERE
Long arc, short arc, heliarc and in-the-dark!