A sample from the products for the Fenders ('74-'75) include: Bolt,hex Head,8x42, Washer-plain-small,8m, Washer-spring,8mm, Screw-pan Head,6x14.
Check out any of the twenty-one Fenders ('74-'75) components enlisted.
In this schematic the "Washer-plain,6mm" is used most often.