904 low gear- which vehicles and which internal parts?
Another place I order from regulary is
www.bulkpart.com They should have pump gears. They have more newer parts such as complete overhaul kits or most any wear item type part and a few hard parts but for hard parts I usually use WITT cause their a bunch cheaper. That's not to say Bulkpart is expensive because their not. WITT is just unusually cheap on hard parts.