The latest craze in the never-ending shock evolution has been the rear shock trunnion mount. The use of threaded bolts requires a more complex reducer hardware.
This hardware kit allows users to swap out thru-shaft, and other trunnion mount shocks, for a standard shock. This kit includes adapters for both upper and lower eyelets.
Note that these spacers are designed to work with non-flanged DU bushings. They will hold up under "normal" riding conditions, excessive bottoming increases the chances of them bending. By purchasing, you are realeasing all liability.