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Getting the stripes right should not be a problem if yours are painted;(vinyl may not be a problem either) temp mount the spolier, sand the whole spoiler in 600#. carefully mask off the lines for the stripes.spray base, remove tape, #2500on just the veryedgeof the white base (do not sand the whole new base on the stripes; just lightly over approx 1/4" of the edge.) Two coats clear and reinstall. Each shop will have slightly different approachs but it shouldn't be a problem making it look like it was there when the stripes were originally put on. ...I forget though, seems I recall you said you had vinyl.