Our flares arrived without instructions and we started the install outside of normal business hours, so we just dove right in. We used a silver Sharpie to mark where to drill holes and trim sheetmetal. All told, we ended up about 31/2 inches past the stock opening at the rear, and about 2 inches past it in the front. We chose to locate the flare by aligning the front corner with the edge of the header panel. Had we overlapped the fender flare over the header panel, we'd have ended up with a more even cut on the outer fender. We later discovered that Iceland Offroad has instructions on its website, and instructions are normally included with the flares, but in the rush to get them to us in the time promised our installation instructions got lost in the shuffle.