Dennis,
Not sure who actually makes them, but both of my chargers, the manufacturer has available the wiring to charge all the popular size packs. I use a Triton II and it comes with the 2s and 3s cords, however I was able to call my local (100 miles away local?) hobby shop and they had the one I needed in stock, the mailed it to me no hassles. I think there are only two basic styles at least now? the Thunder power, and the type on the Evo,, which I think is flightpower? If your hobby shop has anybody that knows electric give em a ring, if not call the manufacture of your charger, if not check the website, or call tower? good luck,
I know I am sure happy with my EP-40 now,, This weekend I will be playing with an Eagle tree Data recorder and RC buddy loaned me, I have 4 props I have tweaked to experiment with, its gonna be fun!

BP Hobbies has an extensive line of balancer connectors, both prefabbed and single ended for making your own.  They have a great website and are VERY knowledable.  These guys fly and can answer your questions!

http://www.bphobbies.com/view.asp?id=V815101