Good question. My installer said that the 1M side skirts were definitely needed for the wider 1M front fenders to line up properly down low where they touch/butt-up against the side skirt. I had hoped that I would be able to keep my stock side skirts to save money, but he said that they did not line up properly with the 1M front fenders. My installer did not say if he would have to do anything for the stock rear quarters to line up with the 1M side skirts, but I will explicitly ask when I take delivery and let you know.
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