These mirror covers are super easy to use. First, make sure your stock mirror cover is clean. Then, just use the pre - installed double - sided adhesive to stick the carbon fiber mirror covers on in seconds. They fit 2015+ WRX and STI models with turn signals in the mirrors, specifically 2015 - 2019 STI and WRX models with turn signal holes. For maintenance, you can gently clean them with a soft cloth and some mild car cleaner. Avoid using abrasive materials that could scratch the carbon fiber finish. Keep them away from sharp objects to prevent damage. With these mirror covers, your car will look unique and stylish.