hi, is this part designed to fit inside the frame. what gauge is the material. thank you

Hi Donny, The part number in question is 3/16” in thick and it is designed to be installed on inside part of the frame, but inside the frame rail  since the frame rail measure 5-11/16” and the stiffener measures 5-3/4. Feel free to reach out if you have any further questions. 

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