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Take time to adjust the rear corner of the light housing so that the bumper cover does not put a lot of pressure on it and cause it to flex.
I have seen a lot of factory housings that have stress cracks originating from the rear edge of the lense. The lenses are spring loaded at the front, but you can adjust the mounting bolts to allow a small amount of clearance.
Mine were both cracked, and since I replaced them, the cracks have not come back.