I have these too. They really help keep the car clean.Today I installed the rear mud-flaps.
installation was pretty quick about 10 minutes per side.
1. remove wheel.
2. line up mud flap and score holes where the metal retainer will hold.
3. attach metal retainer to plastic and using a cordless hex driver, drive the screw threw the fender plastic.
4. back out the screw and then put on the mud-flap and then drive the screw threw it and into the metal retainer.
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