Interior

Floor mats, organizers, screens, and cabin upgrades.

Interior is where fitment goes wrong most often, because manufacturers reshape cabins mid-generation without renaming the car. Floor mats are the worst offender: a liner scanned for a pre-refresh footwell will not sit flush in a refreshed one, and the older listing usually carries more reviews, so it ranks higher and gets bought more. Screens, consoles and organisers have the same problem one level down, at trim rather than generation. The rule that saves the most money here is simply to confirm which generation and trim you have before comparing anything else.