I don't know about a kit but...
I'm sure Garhauer can put one together for you even if they don't have one already made up. Garhauer is the OEM for Catalina's hardware and is a great company to do business with. I would have saved money had I gone that way. I tried to save some money by buying some parts on clearance at West Marine. I didn't buy good enough parts the first time and had way too much friction in the system. You need good, ball bearing blocks for the base of the mast and for the turning blocks on the deck. It's amazing how much friction a couple of turns can add to your system.