I used one 2″ x 6″ and one 1″ x 4″ with smaller cut pieces screwed on in order to make the 2″ width.
You can see that the 2″ x 6″ in the rear of the picture (near the cab) fits perfectly in the built-in slot, while the front of the picture (near the tailgate) would likely fit two 2“x6” pieces or three 2“x 4″ pieces.
Because my bed is un-lined, I didn’t fully follow the measurements for the wood put forth by Ford in their videos. They mentioned that you don’t want a tight fit, but rather an easy fit. The final measurements for my dividers (after 4 or 5 attempts) are:
Posterior (towards the tailgate): 54.375 inches (54–3/8″ or 138.1125 cm)
Anterior (towards the cab): 43.5 inches (43–1/2″ or 110.49 cm)\
Notes
Remember that my bed has no liner in it at all.
My initial thought was to make the boards fit more snugly so that they won’t rattle on the road, but I ended up with too tight a fit, struggled to get the piece out, and ended up gouging the paint. In the end, they fit loosely, but I hear no noise while driving.
The 2“x6” is rather weighty, so if I were to redo this, I’d do what I did for the anterior piece and use the 1“x4” with screwed on end pieces to fit. Trying to reach into the bed and lift the 2“x6” with one hand is difficult
The anterior division closest to the tailgate is the perfect-sized space for filled reusable grocery bags
I got the cheapo cheapest package (only added the Co-Pilot system). While it certainly feels low cost, this gives me wiggle room to upgrade!
Included are some measurements I’ve taken of the FlexBed, pickup bed, along with a closer look at the factory screw holes.
Note: My bed neither has a drop-in nor a spray-in liner.
Rear of Bed (near cab)
Green: rear wood plank divider slot
Blue: widest measurement above the wheel wells
Yellow: Indent on top of wheel wells
Pink: points to the direction of truck cab, rear wall of bed
Tailgate
Red: maximum width opening of the tailgate
Green: Height to top of tailgate lip from the lowest part of bed floor (the concave, not convex portion of floor ridges)
Blue: denotes the tailgate and both D‑pillars
Bed Side
Hot Pink: denotes truck cab, tailgate, and bed floor
Beige: location and distance between bedside anchor screw holes
Medium Purple: distance between first set of bedside screw holes
Orange: distance between second set of bedside screw holes
Yellow: distance between third set of bedside screw holes
Light Blue: distance between fourth set of bedside screw holes
Green: length of bedside screw hole channel
Red: length of wheel arch shelf
Light Green: Space between rear of bed and rear wood divider
Medium Blue: approximate length of groove on top of wheel arch shelf
Dark Purple: width of both wood diver slots
Dark Blue: length of wheel arch shelf before it curves to the side of the bed
Gold: length of area between D‑Pillar and where the wheel arch starts to curve
Light purple: distance from top of bed to floor of bed
Flex Bed Notes
The length of the bed = the length of the anterior wood divider slot (43.5in or 110.49cm), making the Flex Bed an almost square flat wall to flat wall (see pictures at bottom of post)
The pre-drilled bed side holes are in unequal increments
Bed side anchor point holes are all about 2 inches apart
The Bedside screw hole channel is useful for turning and fitting the wood dividers for the flexbed
Floor tie down anchor point holes are different from the bed side ones (scroll down to see more)
M6 x 1.0 are recommended fasteners (Metric), with 1⁄4″ is most similar in size (SAE)
Bed Side Anchor (near D‑Pillar)
The anchor holes (side and floor) are not threaded, so you’d either need self-tapping hardware or a tapping set.
Side anchor holes are M6 sized
Bed Floor Tie Down Anchor Point
Floor anchor holes are not threaded
They are larger than M6 screws, so are likely M8 sized
Hard to find anchors for this hole distance
M6x1.0 is too small
Bed Side Screw Hole
Bed Side screw holesare threaded
M8 screws fit perfectly inside
Threaded
M6x1.0 and 1⁄4″ are too small
But the M8x1.25 fits perfectly!!
Pictures for Perspective
You can see the piece of wood which is the anterior wood divider. It fits perfectly lengthwise in the bed. The posterior divider is in place.