The C21 range contained both Goblin and Undead Cavalry. These were all single piece castings. In the US, the Skeleton Knight was released in the FTS range, and the first Wraith Rider in the Fiend Factory range.
C21 Undead Riders
C21 Undead King
C21 Wraith Rider
C21 Skeletal Knight
C21 Skeletal Fanatic
C21 Grim Reaper on Hell Horse
C21 Wraith Rider
C21 Plague Rider