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 Model 2178-A was designed to fit the Atwood Yoke Latch 2" trailer couplers. This style trailer coupler is usually found on open Utility Trailers or Travel Trailers. 

 Model 2516-B was designed to fit BullDog style 2-5/16" trailer couplers. This style trailer coupler is usually found on heavy duty trailers such as those used in commercial applications and heavier weight-rated trailer applications. In most cases, Bulldog style trailer couplers will be found on commercial trailers, but in some cases trailer manufacturers offer Bulldog couplers on non-commercial t

 This set is intended for customers that already have (or are purchasing another) a Proven Industries lock and need 2 puck locks and want to key everything alike.  Just replace the current lock cylinder with the extra cylinder included in this set. An allen key is included for your connivence!  Included in set: 2 400-XL Puck locks Keyed Alike 1 Key and Cylinder Keyed Alike 1 Allen Key