I did this mod to my 2520 last January when it was new. Off the trailer,right into the garage,factory seat removed. I'm sure this will work for the 2320 and the 2720 also. I didn't realize until I took the seat out of its box that the dealer had included the "Attaching Parts Kit" at no extra charge. I got the seat for a really good price too,(400.00) so I kind of lucked out a little bit.
As for the entire kit,it isn't needed. I found out later,that the two rails outlined in orange are all that is needed.
Their numbers are: M148651 and M148647. I think they are in the neighborhood of 70.00 for the pair.
The first and second pics are what comes with the kit. The third pic shows the original seat sliders. They are unbolted,that's why the one is leaning.The fourth pic is the seat bracket that bolts to the sliders.