To discover exactly which parts you require use the on-line schematic exploded diagram - it will even give you some idea of where and how to fit those new parts.
This CARBURETOR (MODEL X) fiche contains the largest amount of spare parts with eighty-seven listed items
The Suzuki GS550M 1982 (Z) (E02 E04 E06 E22 E24 E25 E34) parts lists consist of seventy-six schematics.