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This is a pilot buffer plate used on the EMD GP35. It is designed to scale for HO model trains. This part is also designed to be used in conjustion with part Assembly_Scale_Draft_Gear_Box_GP35. Modifications to the model need to be done to use these parts.
This part is designed to be used with teh Sergent coupler. If you want to use it with a Kadee coupler, you will have to shim the coupler.
Check your prototype for what type of buffer plate to use.