In this image:
the rear footwell trim wraps around the front and goes back pretty far towards the rear of the footwell.
Most crew cabs I've seen, appear to only have a front trim piece that wraps around the front and stops at the front edge of the rear seat, about where the arrow is in the picture.
In the pile of parts that came with my current crew cab I do have a second trim piece that starts close to the rear most screw hole on the smaller trim piece for the drivers side. The second trim piece seems to be overlapped by the smaller trim piece and runs almost the entire length of the inner footwell and wraps around the rear of the footwell. However, when I look under the truck there are no screw holes for the longer trim piece that would wrap around the rear of the footwell. Anyone know what determined the type of rear footwell trim that came on a crew cab?
My best guess is Custom trim level only got the front piece and Lariat trim level got a full wrap around as either one or two pieces.