Using these mirror covers is a breeze. First, make sure your vehicle is from the specified model years (2015 - 2021 Subaru WRX/STI or 2016 - 2017 Subaru Crosstrek). If you have a WRX/STI, remove the stock block - off plate for puddle lights. Then, just install the mirror covers following the simple installation steps. Remember, these covers are not compatible with vehicles that have puddle lights or our Subaru OEM puddle light kit. For maintenance, regularly clean the mirror covers with a mild car cleaner and a soft cloth to keep the gloss clear coat finish looking great. Avoid using harsh chemicals that could damage the paint or the finish.