Using these mirror caps is easy. Just install them on your 2015 - 2021 Subaru WRX or STI following the standard installation steps for car accessories. When receiving the shipment, make sure to check it carefully right away. If you notice any damage, tell us immediately so we can sort it out. To keep these mirror caps looking great, clean them regularly with a mild car cleaner. Avoid using abrasive materials that could scratch the glossy finish. Since they're made of carbon fiber, they're strong but still need some care. Store them in a cool, dry place if you need to take them off for any reason. And remember, most of these are made to order, so be patient during the manufacturing process as it's well worth the wait for a high - quality product.