Variations: In North America, Staks as produced with a black feet and black back end. A blue feet and a blue back end version was produced and can only be available in the Staks Transport Set.
Another variations consists on the Staks weapon. We are rather sure that the short version came with the regular boxed Staks and the longer ones came with the Transport set. These longer ones are exactly like the Machine Robo ones. They were probably shortend for safety reasons.
Another variations consists on the Staks trailer. One trailer has a black top and the other a blue top. We do not know which was produced first, or if it was exclusive to another country.