No they don't have to be molded to the car. What I meant was there was a gap that I had to fill in using bondo, because there was about a quarter inch of space between the top of the skirt and the car. But no, you don't need to mold the skirts onto the car (I would not suggest doing that because if you ever crack it, then you're screwed).
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2004 WRX - WR Blue Pearl 1997 Eclipse GS - Royal Sapphire Pearl