The Washer,plain, 6mm is the lowest priced item on this Left Crankcase Cover - Spark Advancer schematic.
This schematic depicts all components used in the Cb750k 1980 (a) Four Germany Left Crankcase Cover - Spark Advancer partslist.
The Cb750k 1980 (a) Four Germany Left Crankcase Cover - Spark Advancer consists of twenty pieces with the Pulser Assy.gene. being the most expensive.