In this schematic the "Ring" is used most often.
Parts such as the Rear Shock Absorber (gsx550ese/efe): Bearing,rear Shock Absorber, Collar, Bolt(10x115), Bracket,reservoir Tank are included in the Gsx550e 1983 (d) (e01 02 04 06 15 16 17 18 21 22 24 25 26 34 39) Rear Shock Absorber (gsx550ese/efe) parts fiche.