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.
The largest parts list ( COWLING (RG250CH/FCH) ) contains seventy-five products for this RG250F 1987 (H) (E01 E02 E15 E24 E30 E34).
This page contains sixty-three unique part list schematics.