The URS series of universal retrofit couplers version fit into existing boxes that have a central pivot post. It doesn't matter if the box is a separate part, or integrated into the model.

 

Factory applications of MTL/Clones, Accumate, McHenry, Bachmann, Scaletrains and BLI among others will all accept an N-Possible URS series coupler.

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The Patent Pending N-Possible design is the most adaptable coupler mechanism on the market. The retained spring design also radically simplifies installation relative to traditional metal spring coupler designs.

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It’s also desirable to use URS couplers rather than the SBX for locomotive conversions; Locomotives typically have a separate "1015" type box that is more appropriate then the SBX style box.

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If you are looking to convert separately mounted boxes on rolling stock, or perform truck mount to body mount conversions, the SBX series of couplers with a factory supplied box might be a better fit.