What I do is get the hoop in where it must go. Determined by your driver seat and drivers helmet location. secure or tack in.
Fit your rear down bars, trim the package tray. I use shorter pieces of scrap to estimate where the pass through will be. Then cut a hole out while fitting that scrap piece, shaping the hole to the tube. You can cut out large then fill later if you wish.
Pass the rear down bars through the hole and try to fit to the main hoop and hit the floor, trim slowly to get it close. Once you get it as close as possible to the panels you secure or tack in. Now you can figure where your plates will go, possible interference spots and frame tie in spots.
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