Will KARMSUND Floor mirror, black, 15 3/4x65 3/4 " fit in a Citroen C5 Aircross 2021?

The C5 Aircross gives you a wide, square loading mouth: 41″ across and 30¾″ tall, with a floor that is actually wider than the opening at 41¾″ between the arches. Seats up you get 38¼″ of length; folding them stretches that to 67¾″, a gain of 29½″. The catch is the sill, which sits 29⅛″ off the ground, though the floor drops only 1⅝″ behind it, so boxes slide in level rather than falling in. Wide flat packs do well here; very long ones run out of floor before they run out of mouth. Lift heavy boxes to sill height first, rest them, then push.

One long, thin box: the KARMSUND mirror ships as a single package at 65″ × 16¼″ × 1¼″ and 21 lb. The weight is nothing; the shape is the whole job. A 65″ carton with glass inside cannot bend around a seat gap or ride upright, it wants one flat, straight run, and few cars offer that with the rear seats up. Fold the seats in a wagon, hatchback or SUV and the length usually clears. Feed a top corner through the opening first, lay the box flat on a blanket with the glass side up, and stack nothing on top. The corners are the weak point, so pad both ends before it leaves the store.