The group includes the illuminated and non-illuminated scuff plates, the plastic sill trim and the extension pieces that finish the lower edge of the body.
These parts take constant abuse, so the common failure is a deep scratch or a cracked plastic edge rather than a functional fault. Illuminated plates also fail electrically when the wiring that runs through the door aperture breaks. On vehicles with a body kit or running boards, the sill extension is a separate part that is easily damaged and often the only visibly damaged piece after a kerb strike.
Match by side and by trim level. Illuminated and plain plates are different parts, and a plate for a vehicle with a sport package is often wider. Where the sill trim is glued as well as clipped, check whether the listing includes the adhesive strips.