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This a kit to convert the Lionel 65' Modern Mill Gondola to use Kadee couplers in a more realistic coupler box and includes a more realistic truck bolster to make the Lionel trucks look better and appear to have more mass when seen from the side. They ARE NOT exact scale, since the design of the Lionel truck sideframes does not permit that and still have the truck function properly. All the bolsters do is save the effort of cutting off the Lionel claw coupler mounting bracket and make the truck look a little more realistic at a glance ... or when the car is rolling by on your trains ... but not if you derail it and flip the car over ... which you don't really want to do anyway ... :-)
The files have been updated on 5-21-18. The couplers should actually fit in the boxes now ... my apologies for any previous issues.