Jon,
The web site is
www.selectsail.com They have a kit made ready to go.
You do have to make a decision on which ring to use but it is easy to change even on the water, and you still have the same fore and aft adjustment that you always had.
I find that I end up setting the fore and aft position per the mast rake before we leave the beach, and the inbord adjustment is set also and only changed to depower when the wind is really honking, so the clips work great.
Matt