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That connector is called "C401Trailer Accessory Harness to the Chassis Harness". You posted no clue what "plug and play" harness you are trying to connect to the truck. Have no idea what "teeth" you are referring to. If you are trying to use an aftermarket harness I would suspect that to be the problem, not the OEM connectors.

The OEM harness, referred to as the Trailer Lamp Module, is PN 25861049.
 
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