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.
With these VT125C2 SHADOW 2000 (Y) ENGLAND / KMH partsfiches you have access to one thousand seventy-three spares.
This parts-list page (CARBURETOR (ASSY.)) contains the most products with thirty-nine listed parts.