Check out any of the twelve Frame ('80-'81 A1/a2) components enlisted.
Parts such as the Frame ('80-'81 A1/a2): Cap,steering Stem, Nut-steering Stem Lck, Bolt-steerg Stem Head, Race-strng Bearin-ste are included in the Kz550a1 1980 Usa Canada Frame ('80-'81 A1/a2) parts fiche.
The most reasonably priced component used on the Kz550a1 1980 Usa Canada Frame ('80-'81 A1/a2) is the Ball-steel,1/4.