Using these fog bezels is easy. First, make sure your car is a 2018 - 2021 Subaru WRX or STI and it's a base or premium model. You don't need to make any changes to your car, just install the bezels as they are. They come as a pair, so install them on both sides. When it comes to maintenance, just clean the gloss black housing with a soft cloth to keep it looking shiny. Remember, the fog lights are not included, so you'll need to use your existing ones. Also, since limited cars don't have the right wiring, these won't work on them.