A gearbox overhaul will be easier when using as many brand new parts as possible, particularly the high wear items like this
Drum, the gear selector forks and other related gearbox components.
Always check the part numbers are compatible with your model prior to ordering!
Save the bother of having to strip the gearbox all over again when another one of the old used items fails! Order all the gaskets and seals required at the same time and save money on extra shipping costs later. Try this gasket sealant: 08C70K0234M.