The oil pump assembly, as you are aware, is of critical importance - without a full supply of lubricating, cooling (and that is important on all engines) oil the newly refurbished engine will suffer excessive wear and even possible damage.
Replace as many of the old components that make up the assembly with new - better to be safe, than suffer a wrecked engine due to oil pump failure!
This one of a number of parts you may require, below are more related components:
Buying from us is the easy way to purchase all your Japanese motorcycle parts online. Ask a member of our staff, if you are unsure, to help guide you through our user-friendly system from opening an account to ordering the parts you require. Check the products gallery and our online schematic for other consumables and spares to make your machine feel as special as it was when it left the factory.