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B&W Trailer Hitches Custom Installation Kit For Universal Mounting Rails For Some GM Trucks Model RVK2503 18 1/2" a 2-1/8" sha nk lengthB&W Trailer Hitches Custom Installation Kit For Universal Mounting Rails For Some GM Trucks Model RVK2503 Custom installation brackets provide a No Drill alternative to install mounting rails in the bed of your truck. Custom installation brackets mount beneath your truck bed to provide attachment points for 5th Wheel hitch rails Bolt on application Sturdy steel construction Powder Coat Finish 2 Base rails, custom brackets, and hardware included