When overhauling the gear selector drum/forks assembly, replacing as many of the worn and/or damaged items as possible will simplify the rebuilding process and subsequent adjustments required to set up the selector assembly 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 positive and satisfying gear changes, which is important on machines of the type this component suits.
Other related components you may wish to consider:
Don't forget to order all the seals and fasteners (new sharp threads and heads just make life easier) 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/are correct for your model.