The component with the lowest price in the REDUCTION SHIFTING (RV125M schematic is the 01500-05103.
The Reduction Shifting (rv125m assembly is constructed from several parts from which the Reduction Shifting Lever is the most expensive.
Some items from this specific schematic: Arm,reduction Shaft, Lock Washer, 08310-11058, Washer(10.1x21.4x0.8).