silver -- on the right -- Fox Shox Reducers 803-03-030 FOX part 803-03-030 21.84mm X 8mm --- those you would use with the DU bushing .. the ones on the left, you'd remove the DU because those resin plastic bits take the place of DU's -- sorry for the ghetto measuring device, I can't find my fancy caliper

 Just serviced my rear shock and switched over to the resin bushings. Was going to install the new Corset air sleeve, but was shipped the wrong size. Let me know if you want a review once I get the correct one installed and tested.