This BAKFlip MX4 is made for the 2021-2027 Ford F-150 with the 8' bed. For reference, the box is about 97.6" long. Re-engineered prop rod clips hold it upright against the cab, and rubber bumpers protect the cab paint. Revised EPDM perimeter seals and tight-fit clamps help keep weather out, and drain tubes carry off water that reaches the rails. Its Gen 3 aluminum panels sit over a high-density polymer core, and BAK rates them 22% stronger than the original MX4. Its two-piece rails join with couplers to span the 8' bed and clamp on with no drilling, and BAK rates the install as Level 1, 30 minutes or less. BAK's 5-year limited warranty covers it from the original purchase date.