When overhauling the transmission, replacing as many of the wear items as possible will simplify the rebuilding process and subsequent adjustments required to set up the gearbox correctly.
This is just one of the components you may wish to renew rather than re-use.
This approach of component renewal will improve the change quality and help achieve a smooth, quiet running transmission assembly.
Other related components you may wish to consider:
Don't forget to order all the gaskets, seals and bearings required in one economical shipment.
Try this pro-workshop gasket sealant, 08CRAHLG120G to complete the job to professional standards.
Please be aware that this component may have other applications within the Ducati model range - so ensure the part number/s you order is correct for your model.