Z&I

That is what I just found when I went back to their site.
The site has to have been updated within the last month or so since I last was on it.
That is their newest one.
The single switch one I was referring to isn't on there any more.
Give them a call or email to see if they still have the single one in stock or if they can make one for you.
You really only need the 1 switch for the slip control.
It looks like a regular tear drop selector switch on the outside but the electronics underneath are the heart of it.
But that 3 switch one looks to be pretty awesome if you have a use for it.

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