vskid3, the gap filler on the front wouldn't have to be much different that what you did in the back.
BabyDiesel here is what I used from Lowes to stop the flaps on my skirt.
Its slotted and you can see in the picture on it that its slightly folded which gives you the ability to bow it for clearance and retain rigidity. I mounted it on the bottom of the skirt so the folded part tapers back toward the tire. Everything is nice and tight and slender in its cross section.