Park on level ground and set the parking brake. Removing the wheels and tires gives easier access to the fender well but is not required. If you remove them, support the truck on jack stands. Clean the fender where the bracket will sit, removing any dirt, grease, or undercoating so the bracket sits flat. Wear safety glasses when drilling.

Hold the universal bracket against the fender where you want the mudflap to sit. The TSO logo cutout should read correctly when viewed from inside the fender well, and the bottom of the bracket should angle away from the tire. Make sure the outer edge of the bracket is perpendicular to the ground, this will ensure the mudflap its self is parallel when installed. Choose four slots that are evenly spaced from top to bottom and mark each hole location on the fender.

Remove the bracket. Drill each marked location with a 3/16" drill bit. Remove any burrs and clear all metal chips.

Align the bracket with the drilled holes and insert four #10 bolts through the bracket and fender. The large fender washer will be used at this point. Secure them on the backside with washers and nuts and tighten evenly.

Align the bracket with the drilled holes and insert four #10 bolts through the bracket and fender. Secure them on the backside with washers and nuts and tighten evenly. Place the mudflap against the mounted bracket and align the holes. Insert four #10 bolts through the mudflap and bracket. Secure them on the backside with washers and nuts and tighten evenly until snug. The mudflap will be mounted on the side closest to the tire. See photo for reference. Confirm the mudflap hangs straight and clears the tire. If needed, loosen the bolts, reposition, and re-tighten. If the wheels were removed, reinstall them, lower the truck, and torque the lug nuts to OE spec.