comments:
ottercakes- posted on r/ikeahacks3d
You may have already found a solution, but I ran into a similar issue when Ikea failed to deliver the the observator product. Although observator comes in "X" shape, the function of using "<" shape is structurally equivalent. See example drawing. The product I ended up buying was similar to this one on amazon. The added benefit is that this also has easy tension adjustment. https://www.amazon.com/Hillman-Group-852058-42-Inch-Turnbuckles/dp/B00EALRBHU