I made a set out of pressure treated 4x4. Cut them down, drilled the holes in the center and soaked them in a can of sanding sealer. They worked just fine and will probably be there after the bed rusts off of the truck for the second time! I thought the offset washers were to keep the main bed bolts from turning and pulling through the wood.?? Does anyone have a template for the position of those holes?

Mitch