I just talked to the dealer about this part ...
He said it is a direct bolt-in retrofit for the Z920R ... his instructions were basically ... remove existing seat assembly ... unbolt sliders from seat ... bolt sliders to seat deck ... mount suspension unit on top of sliders ... mount seat on top of suspension unit.
I told him I had a reasonably well equipped shop and wasn't afraid of a little fabrication, if necessary, but I wanted to know in advance just what was going to be required. He said there was absolutely no need for any drilling/cutting/welding/tapping/trimming ... it is a straightforward bolt in.
Any input and/or criticisms of this unit ??? He said one reason this unit is cheaper than the factory J.D. part is simply due to the fact that you do retain the original slider mechanism instead of replacing it.