BAKFlip MX4 Hard Folding Tonneau Cover for 2017-2026 Honda Ridgeline (5'4" Bed)

Here's the short version. Follow BAK's install sheet (below) for your truck's exact clamp positions and settings.

1. Build the mounting rails. Remove the two upper tie-down hooks with a T-50 Torx (keep the screws and hooks). Slide two rail brackets into each mounting rail, one toward the cab and one at the tailgate end, and loosely assemble the cab bracket, rear bracket, tap plates and socket-head screws with a 3/16" hex wrench.
2. Mount the rails and seal. Set each mounting rail on the truck with its front cap pad firmly against the bulkhead, line the brackets up with the tie-down bolt holes and refit the hooks with the T-50 Torx (the front hook goes back upside down from how it came off). Tighten the socket-head screws while pushing the rail down and forward, insert the rail end corners at the tailgate end, and stick the bulkhead seal along the back edge of the bulkhead (not needed with a drop-in bed liner).
3. Clamp the side rails. Fit the drain tubes to the front of the side rails, set each side rail flush with the top edge of its mounting rail, drain end toward the cab, and attach it with three clamps: the front one 6-8" from the bulkhead, the rear one near the tailgate and one centered. Push each clamp up as high as it goes, keep the rail level, and tighten to 10 ft-lb with a 1/2" wrench or socket.
4. Prep the cover. Slide the two cover retainer clamps into the track under the cab end of the cover, one per side. Peel the liner off each gasket, stick it under a buckle end, and screw the two buckle ends into the pre-drilled holes on the front header panel with the screws and nutserts. Hand-tighten only; don't use a screw gun.
5. Set the cover in place. Lay the folded cover on the side rails at the cab end, centered between them, and turn the retainer clamps clockwise until the lock washer is snug. With the cover still folded, clean the spots for the cab bumpers with soap and water, then isopropyl alcohol, let them dry and stick the bumpers along the top edge where the cover meets the cab.
6. Unfold, adjust and check. Unfold the cover toward the tailgate and center every panel side to side and front to back; the rear edge and tailgate seal rest on top of the tailgate with a 1/2" overlap. With a power tailgate, make sure it still works with the cover closed. Release each latch to check it engages the rails (the sheet shows how to adjust a slam latch), then re-tighten the retainer clamps. BAK's warranty asks you to re-check every clamp after your first week of driving.