Cummins does not make water pumps as far as I know. Various OEM suppliers make them, or good aftermarket options also. The one in the cummins box will come from china as likely as not, doesn't mean it's not the best option, probably the most expensive option.
There are updated designs that are used in newer high HP versions of the engine, that you may want. Even though a 300HP C8.3 seems tame compared to 450HP ISLs, that 300HP rating was higher than trucks got at the time, and way higher than tractors got out of the same engine, so putting a higher capacity water pump on isn't a bad idea. The part numbers may supercede, or show an optional upgrade. You can search the part numbers to show the differences, open vs closed impeller, more impeller fins, plastic vs steel, etc.
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