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This kit provides truck bolsters to narrow the Lionel Sideframes to mount on the Lionel 65' Mill gondola and provides a more realistic Kadee coupler mounting box than the stock Kadee 745 that comes with the couplers. These parts are not exact scale, this provides ability to better operate on model RR curvature, but will only be visible if you derail the cars, which, I am guessing isn't really desirable. I have tested the coupler box with a virtual model of the Kadee 745 shank and thus, these coupler boxes 'should' actually fit properly. The bolster narrows the trucks nicely and DO work without too much difficulty at all.