If the fender liners (those plastic pieces inside your wheel wells) on your 2012 or 2013 Kia Optima are cracked, torn, or missing, this Evan Fischer set is a perfect replacement. You get both the driver and passenger side front liners. They're made to OEM specs, so they should fit just like the original parts (compatible with part numbers like 868124C100 and 868114C100). Fender liners are important - they protect your engine bay and components from road debris, water, and salt, and they help with aerodynamics and reducing noise. These are brand new, come with a 1-year warranty, and are a much cheaper fix than ignoring the problem and letting rust start. Installation is pretty straightforward if you're handy; you'll need to remove the wheel for best access. A solid, affordable repair part to keep your Optima in good shape.