The oil pump assembly is, as you are no doubt aware, of critical importance - without a full supply of lubricating, cooling 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!
Other components that are related to the oil pump assembly you may wish to add to the same shopping cart:
Don't forget to order all the gaskets and seals required in one economical shipment?
Pro-workshop gasket sealant, 08C70K0234M - used by engine building professionals.
Add as many items as you wish to the same shopping cart, new screws 0211206253 shim 0918110158 and pin 0926104009 for example, and still only pay the same single fixed price shipping cost.
This component may have other applications within the Suzuki model range.