Can I retrofit the Ultimate bushing package on RockShox Select + and Select forks? The bushings are sized and installed into the lower leg at the factory. The only way to upgrade the bushing package is to install the MY23 Ultimate lower leg. Related articles Are there differences in RockShox lower legs between Ultimate and Select+? What’s different in the Ultimate level bushing package? How does it benefit my ride experience? How do I know if my RockShox fork has ButterCups? Why did RockShox decrease the max travel for MY23 Pike and Lyrik forks? Besides travel, what are the differences in chassis and air spring design between the 2023 Pike, Lyrik, and ZEB?