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.
GS1000H 1980 (T) (E01 E02 E04 E17 E18 E21 E22 E24 E34) section with seventy-four Other schematic pages.
The CARBURETOR schematic contains the largest amount of parts with eighty-five listed products.