I can't tell from the photo but you might check your angle to see how much protection you'll get. I cut mine way too short (concerned about flapping) and they are for all intents and purposes useless. So yesterday I was off to NAPA to get two more of their truck flaps to cut down.
I checked the angle this morning by putting a straight edge where the rubber meets the road and bringing it up to the base of the flap and then to the bottom of the back bumper. Quite a difference.
Now 15.25" total length. 21" needed to have debris clear the bottom of the bumper. Don't know if I'll make them that long though.
And I should bring them outboard about a half inch.