Just installed a 2015 Mazda 3. Existing holes and rivets in the wheelhouse used for the front end. Aligning the drill holes is a bit tricky. I put a small pin in the hole, "knocked out", then drilled a mark. I then measured the second hole in relation to the first on the paper template and transferred it to the fender. It took a bit of effort to line up the second hole but I managed it, great. I drilled mirror holes for the second front wheel. The rear was a problem. There are no existing holes or rivets in the wheel arch. However, there are holes under the rear bumper. At these points I drilled two holes. Additional rivets must be purchased separately. I bought a pack of "Universal" clips/rivets. I like her best. I'm planning an upgrade but they look great!