It is important to state what year on these questions. You can buy a piece that is for the "rocker" and possibly use it for the rib shape at bottom and around wells. Approx 40'' long. How can we give pics/advice of what's involved without seeing what's involved? Any metal should work, a door skin would work, 58-59 fleetside bed side pieces will work...... The semi-challenging part is the rib (as mentioned above re: rocker) but it is easy for someone with forming tools. Google: Flex Edge Wheel Arch . May help, may not. Bottom part of door skin available, 7" tall, $40. or skin from a donor door.
