Replacing as many of the high-wear and damage prone items at the same time will attain the best results. Interfacing used parts with new may lead to premature wear of the new parts and a noisier transmission.
Other related components you may wish to consider:
Add as many components as you wish to the same shopping cart, new 28mm collars 23442ML7000 spline collars 23482MR700023512MR7000 & spline washers 90451MR700090452MR7000 for example, and still only pay the same single fixed price shipping cost.
This component may have other, sometimes unrelated applications within the Honda model range, so please always check by the part-number rather than the description prior to ordering.
Pro-workshop gasket sealant 08C70K0234M - easy to use with excellent results.