The plastic clips seem to have too much slop to keep the liners secured. What I've had to do to get them in place and then to STAY in place is to loosen all the plastic fasteners, place the liner in place where its tight and snug and completely over the ridge of the fender, reinsert the fasteners and then drill 2-3 holes and insert additional sheet metal screws to hold it in place. Haven't had any problems in years now.. or maybe they stopped shrinking..