The Bolt-flanged,6x14 is the cheapest item from this partsfiche.
The sub assemblies and components that make up this Gear Box include this Case-gear,rh, the most expensive part.
Some items from this specific schematic: Clamp, Bolt-flanged,10x25, Gasket, 10,5x16x1 (nas), Seal-oil,vc-6x10x2.5.