We ordered the structural steel support from Flarespace. At the time, I don’t think these were a regular item they sold, but we happen to see it in one of their Flarespace videos, and that is what gave us the idea to add it to our van. With that said, they were really great and were willing to sell it to us. I believe we paid about $400. This was a really critical part for us because our bedframe is constructed of 8020 extruded aluminum, and we were able to bolt our bedframe supports directly into this. Without the steel, we didn’t have many attachment options in the van wall and so this was a great way to solve that problem!