JK and JL headliners are NOT compatible. Just installed a hothead headliner in my JL Sahara and am pretty impressed with it. As far as your fenders go, I am not sure. My flares are painted so I do not really have to worry about that.I assume that the JKU MOPAR headliners fit the JLU interior? Also I just ordered Billet Silver JLU Rubicon with black fenders. What types of cleaners are used to keep these fenders looking new
Mike