Yes, that is the kit. I installed one on my 3320 last summer. It comes with the position control lever, hardlines, fittings, rear bracket, and one half of the quick connects. The kit was not that hard to install, just time consuming. You have to remove the seat, seat shroud, right rear wheel, and I believe the right rear fender as well to get to the selector control valve. A new slot must also be cut in the right rockshaft control area for the new position control lever. I cut this using a dremel tool ( the outline is already on the bottom of the shroud). I thought the hardest part was feeding the hard steel lines through the existing ones and getting them to line up. I really didn't want to remove the existing lines for fear of leaks but finally did have to loosen them to get the new lines in. And I worried about that for nothing since I had no leaks after finishing the job. Just be sure your selector control valve is a 3 service. Meaning if you look at the scv that the loader joystick goes into you have a third service with fittings blocking it off that you will plumb the lines too. There is a note on the kit:
A) FACTORY INSTALLED TRIPLE SCV ONLY. REFERENCE DTAC SOLUTION 78478
Hope this helps and isn't too confusing. Really it wasn't very hard just time consuming. As I recall the instructions included were pretty good.
Mike
I think all 3320's have triple scv but I am not sure.