I have the koplins and they work great but my 14" Bighorns occasionally rub them. I think the factory ones or other models bolt onto the outside of the fender which gets them away from the tires, especially larger ones. The Koplins do a great job of keeping the mud off though so if you not going with huge tires they work fine. I had to heat mine up and bend them a bit to get the clearance i needed but they still hit occasionally when I bottom out. Mostly hit around the footwell area but doesn't cause an issue except for the noise on rare occasions.
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