The most reasonably priced component used on the Cb750k 1980 (a) Four England Left Crankcase Cover - Spark Advancer is the Screw,oval,5x25.
Of all the components used in this assembly the Pulser Assy.gene. is the most expensive.
A sample from the products for the Left Crankcase Cover - Spark Advancer include: Advancer,spark, Screw,cross 6x25, Bolt,flange,6x40, Bolt,flange,6x32.