A sample from the products for the Fenders ('73-'74 S3/s3-a) include: Clamp, Washer-spring,8mm, Washer,6.5x20x1.6, Collar-rear Fender.
This schematic depicts all components used in the Kh400a5 1978 Usa Canada Fenders ('73-'74 S3/s3-a) partslist.
On this parts fiche the Screw-pan Head,6x14 is the most specified component.