Check out any of the forty-two Front Fork (kz550-a4) components enlisted.
Parts such as the Front Fork (kz550-a4): Cover-fork,lh, Bolt,8x55, Plate,fork Cover,lowe, Valve,air are included in the Kz550a1 1980 Usa Canada Front Fork (kz550-a4) parts fiche.
The component with the lowest price in the FRONT FORK (KZ550-A4) schematic is the Nut, 8mm.