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These SRB tops are designed to replace the Monogram/Revell kit tops. They are more accurate to the later shuttle missions and have much more accurate frustrum areas. The stock parts also inaccurately have two access doors and this corrects that. Using these parts require cutting the original model and accurately measuring to align parts back to make the stack function. Also note these do not have the separation rocket motors as those are better printed in FUD material. Some advanced modeling skills are recommended. For even more accuracy, they can be used with my SRB art skirts and/or my ET intertank part.