If you didn't but your bike new then chances are the c-spanners to adjust the pre-load on your rear shocks are missing. 58mm REAR SHOCK PRE-LOAD. will fit Öhlins rear shocks on XJR.
Tusk Shock Preload Adjusting Tool
For Honda Odyssey RC3 Elysion Rr8 Rear engine Shock Absorber Spring Rubber Mat
VW Audi OEM Tool T40255 Rear Axle Shock Absorber Counter Hold Tool 9mm
1Pair Rear Trunk Shock Gas Lift Supports Shocks Struts Arm Rod Fit For XL EXT
Pair Fit For XL EXT Rear Trunk Shock Gas Lift Supports Shocks Struts Arm Rod
For Dodge Chrysler Rear Axle 6602 Differential Bearing Preload Wrench Tool C4164