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This item is for those that want to have body mounted couplers on their AHM Flexi-Flo hoppers. You will have to remove the entire bolster and frame runners from under the floor. Clean the underside of the floor flat and this part will fit into the bolster hole. You will also have to cut a notch in the end sill for the draft gear box to fit through. Cut it only wide enough for the draft gear box. Use an Accurail draft gear box lid.
The holes in the bolster and draft gear box are to be drilled and tapped for Accurail 2-56 screws.
After trimming out the necessary plastic from the model and tapping the holes, you can then glue this part to the model with CA.