This is a direct replacement for the incorrect fuel tank on an N Scale Con-Cor GE 4500 Gas Turbine locomotive. The new battery box fits without modification to the chassis. Simply remove the screw on the underside and the old fuel tank will fall off. Add the new battery, ensuring the trucks are in the right place and replace the screw.
It is available as a single item here.
Or as a pair here.
This part is printed in the Shapeways FUD material which will require cleaning upon delivery, please see my FAQs for more information.