If you have running boards, Ford says their flaps wont fit.
"• Not compatible with Rock Rails, Step Bars, Trail Armor Rocker Panels, any optional Fender Flares or Sasquatch Package Fender Flares"
The front is what kicks the rocks into the door/rear fender. I only put flaps in the front and haven't any more chip issues. These are the Mabett flaps.
I got this Mabett bracket for 31 bucks on Amazon. You can unbolt the plate holder part for trails. Works well. I used to have it bolted to the shackle, as you can see in my profile pic. This is a much better solution. And, no drilling.
Link...
I went with the Eibach kit from Panda Motorworks. Got a great deal with coupons. $1966.50 with free shipping. Fully assembled, adjustable with included UCA's.
I wonder why some rigs come from the factory with the big rake, and some don't. This is my stock 21 OBX. I don't have the nose down deal I see on a lot of rigs.