The component with the lowest price in the BATTERY CASE/TOOL CASE ('77-'78 schematic is the Washer-spring,6mm.
Some items from this specific schematic: Collar,6.5x8.5x7.5, Washer-plain,6mm, Washer-spring,6mm, Damper Rubber.
The Washer-spring,6mm is the most widely applied product in the KZ1000A2 KZ1000 1978 CANADA BATTERY CASE/TOOL CASE ('77-'78 ( ten times ).