Hatchback fitment is the match between a specific vehicle and the equipment or replacement part you want to install. A roof rack, luggage liner, rear carrier, or hatch component must suit the actual body, mounting arrangement, and operating clearances. Being the right general size is only one part of fitting correctly.
Start with the model year, body version, trim, and relevant factory equipment. Then check the manufacturer's application information and installation instructions. A product that sits in place can still be unsuitable if it loads the wrong surface, obstructs the hatch, prevents a seat from locking, or interferes with visibility.