I used a kit from Newport Engineering. It depended on mounting to a brace under the dash, but my truck was not built with the brace they used and I had to make a bolt on brace for it.
I love mine to but I have to admit the variable speed in my 41 is ALOT better than my F1 single speed. I like my 41s better than my new cars wipers. Who needs delay when you have an infinite number of settings.