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I bought the kit from a vendor at the 2022 Grand National F-100 Show in Pigeon Forge, TN. I don't recall the name. I thought I could find the receipt, but that effort too was a bust. I know I have the information somewhere, so I will keep working on it. The length of the straps is 21 inches. The kit also comes with the spring-loaded latches that install in the stake pockets. Latch and strap open BTW, the spreader bar holds my EZ-UP weights, detailing bag, and soft-sided cooler in place when we travel. In the open position. I adjusted the straps to allow the tailgate to drop below level, so I wouldn't be so apt to drag the EZ-UP across the top edge when loading. Rather, I could set it in on the moving blanket, but you have the option to adjust them however you like. (Shown in next photo) Tucked away under tonneau... I hope this helps. Continued good luck on your truck.😃
He told you in post#6 he had bought them at Mar-K, which is no longer in business. He then said he made the brackets on his current project. I believe at this point you are either going to have to make your own brackets, have someone else make them for you or pony up and buy another style to your liking. Good luck on what you decide.