This is a great product , providing 4 very sold mounting points on the Jeep Hardtop for installing different rack fixtures. For me, a differenet/excellent option over the steel tube perimeter frame racks offered for the Jeep Wranglers. In my application I was able to adapt a set of older Thule cross/load bars and uprights with out much trouble. Recommend reading through the instructions several times then test fit the internal frame with external fittings to understand/see how they fit together, specifically with the interior contour of the Jeep roof. Also, the instructions include removing the hardtop from the Jeep to do the install, I was working solo, so did not take the roof off. I was able to assemble the system with the roof inplace, for sure removing the top makes good sense and would make things easier. Hope this helps. Thanks.
2014 Jeep Wrangler JK Hardtop