A modded Katana is one of my potential future projects, had a 750, and two 1100s back in the day. Surprisingly practical, for such a radical bike. Good luck with your build.
I think the official length is either 360 or 365mm can't remember without checking. Compared to the OE Z650 shocks at 330mm the ZRX shocks are very long on the bike. Also the ZRX swingarm shock mount is higher than for a standard Z650 swing arm. Hence I was so surprised the ZRX shocks worked so well on the bike.
