I would recommend ordering the whole bed as a kit from MAR-K so you can get free shipping & 10% off spring special if there still having it. I bought my complete bed for my 1953 thru them & for everything was right around $1600. I upgraded everything to stainless & had pine wood, smooth tailgate, stainless chains.
You won't be disappointed. I figured by the time I had all the labor & material cost to repair the old ones & still have wavey sides the cost for new was way worth it. Yes made in USA!!!