The CURT weight distribution hitch is a specialized towing system that provides improved vehicle and trailer control by leveling the trailer and more evenly distributing its tongue weight across the trailers and vehicles axles. Weight distribution hitches are commonly used on travel trailers and campers but can also be applied to other large loads. This replacement hardware kit for trunnion bar weight distribution hitches includes hardware for attaching the weight distribution head to an adjustable shank. It includes four conical tooth washers.