Make sure you confirm your model and serial number before ordering as these parts are serial number specific.
The serial number that you'll need to confirm part fitment, in this case, is the frame serial number. The frame serial number is specific to the pump model, not the engine.
The engine serial number is handy to document for when you need engine parts, as a lot of internal Honda engine parts are engine serial number specific.
To purchase WT30X trash pump parts, confirm your frame serial number, which is located on the lower portion of the frame, near the starter side of the engine. (See diagram.)