The Yf1-54016-33-90 is the lowest priced item on this Starter Motor schematic.
The Starter Motor is made up of components including this Starter Assy (edl6500) which is the most expensive.
Some items from this specific schematic: Bearing, Ball (radial),edl6500, Yoke (edl6500), Pinion Gear, Brush (edl6500).