I'm not entirely sure what you are asking here. Plop should give you dimensions of the three triangle support bars as well as the triangles. It should also output the diameter (or maybe radius?) of the mounting points for the triangle support bars. These points should also be where your collimation bolts go. This in turn gives you the spacing between your bars for the tailgate.
I hope I answered your question, if not let me know how I can help.
-KDG
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