Didn't look the part number you posted but I am guessing you mean this:
After a few hits over a couple years the metal plate started to deform a bit causing a crack in the poly - using a 1x3 steel tube spacer rather than the OEM bump stop backing piece would work better long term. They work great with oversize tires but big offset mixed with big tires need more of a spacer to keep the tire off the cladding when flexing.