I'm in the middle of replacing my rear shock. I've been using a shock from a Generation 1 Suzuki SV650. It worked well, but recently I noticed the seal was blown, and I no longer had any dampening -- time to source another shock. Found one used (10K miles) on the SV Owner's List and now I'm in the process of modifying it so it will mount. The top end, with the rubber bushing, needs to be ground more narrow, and the bottom end -- since the SV shock is 3/4" too long -- needs to be re-drilled and one side threaded for the bolt to screw into (10mm x 1.25). This photo shows the stock NX shock, blue in the center, a modified SV shock on the right, and an SV shock in the process of being modified, on the left.