I can't believe Kawasaki makes these bikes with such a small foot on the sidestand. I went with a Puig enlarger. One of my 1st mods to my Z. A couple months ago, I also bought a Z900RS. Little different sidestand, but same foot. Puig doesn't even list the RS with this part. But it fits nicely. Now I don't have to worry. You have a lot of great videos. New sub. Thanks.
Just a heads up. If you want a cool rear rack that doesn't ruin the Z's lines, look into the Hepco and Becker Sportrack. This thing takes the place of the pillion seat and is removeable with a turn of a key. Instantly return to oem pillion. I have a Rotopax on mine for long rides. Tie on 25 liter tail bags, etc. Motomachines Co. sells them. Very useful. German quality.
