With the channel in place, I install the wiper felts. The ends that slide between the channel and door frame need to be flattened more. I check the fit to the door frame and re-bend the back part to fit the opening. Drop them into the opening and line up the clips with the slotted holes. Make sure to line up the front edge with the division bar. When in position, use a large blade screwdriver to snap the clips in place, one at a time. The wiper felts are now installed matching right up with the division bar.