In this schematic the "Washer,plain, 6mm" is used most often.
The one hundred sixty-seven Ct90k6 U.s.a Frame Group-3 component parts are all listed in this schematic.
A sample from the products for the Frame Group-3 include: Collar, Cushion, Bolt,hex.6x28, Nut Hex Cap 8mm, Winker R Rear.