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This was designed to convert AHM and Rivorossi passenger cars. Remove under floor details to allow free movement. Use a Kadee #5 box and "Self Tapping" screws. Support the swinging end with a piece of brass rod or music wire to keep coupler box from sagging over time. I included 2 pivot holes, one for longer overhang and one for shorter overhang. This will convert 8 cars.