I used Husky Liner 56601 and 57601 Splash Guards with my Bushwacker Flares. These are the splash guards for F 150's without the factory flares. On my 2009 truck I drilled my flares and used stainless screws with flat strap nuts on the backside of the flares. On my 2013 truck I used nut zeros and stainless screws so I could remove the flaps and reinstall when I wanted. I also applied some closed cell weatherstripping to the splash guard to fill in the slight difference in contours. I started by mounting the bottom and worked my way up the flares when installing them.
Hey hope all is well. I noticed you have bushwhacker fender flares and mud flaps on your truck. I did have weather tech mudflaps, but just installed bushwhacker flares like yours. Now my mudflaps won't line up anymore. I saw on one of your posts you said you bought husky flaps to go with your bushwhacker fender flares. Just wanted to see if you had any info or part #s. Would be unfortunate to order the wrong ones. Lol. I called husky and they had no idea. Thanks a bunch