If a transmission overhaul is called for then renewing as many of the high wear and damage prone items at the same time will attain the best results. Interfacing used parts with new will lead to premature wear of the new parts and a less smooth transmission action.
Other related parts you may wish to consider:
Add as many parts to the same shopping cart as you wish, new O-rings 0928017004 and bearings 09262250730926220139 for example, and still only pay the same single fixed price shipping cost.
Try this pro workshop formula gasket sealant 08CRAHLG120G.
This component may have other applications in the Suzuki model lineup.