Kenworth Frame Rails Application Search Criteria Please select and/or enter a complete or partial search parameter. The more information you enter, the faster the search. Frame Rail Number: Material: ALUMINUM STEEL Frame Height: 9.125 9.25 9.4375 9.5 9.875 10 10.125 10.5 10.6 10.625 10.75 11.5 11.625 NOTE: Includes Frame Rails, Inserts, and Outserts. Does not include Front Drop Rails. All the Frame Rails listed in this application are service rails and may require modification.