Yanmar doesn't make pumps.
is different between the USA 3GM30
model and 'YEU' model. The "810" is the impeller for the YEU model. The pump is a Johnson F4B-9 (10-24509). Besides a different impeller, you'll notice the cam in your pump is not changeable. The good news, the YEU pump is cheaper (about 1/2) to buy.
Depco can help with the pump/parts.
Depco Pump Company
Cheapest I've found the impeller is:
JOHNSON PUMP 09-810B-1 - 6 Blade Johnson Pump Impeller Kit