Craig, The pictures shown are of 2-1/2 ton series trucks. They have the front fender extension which wont work with your 4400 fenders as your fender heal dies into the rocker molding at the door...the bigger truck fender heal sits proud of the cab and provides a flange to bolt the extension to. If my memory has it right the external running boards for the 4000 and 6000 series were just flat boards with rolled finished ends on the front and back and were mounted on two frame brackets. In all my years playing with TF trucks I've never seen running boards on a 4000 or 6000 series truck!
Making a pair out of flat diamond plate might be easier and faster than trying to source them from a junk yard.
Mike B
