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.
thirty-seven Yamaha YN50 2008 5C21 FRANCE 1F5C2-352S1 parts fiche schematic pages.
YN50 2008 5C21 FRANCE 1F5C2-352S1 section with thirty-seven Other schematic pages.