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I omly see the 1 crack in the cover. The covers come off with a few screws, you can get a used one or weld/grind/repaint yours (they are metal if I recall-had mine off once to repaint). If the other crack is in the fascia, go to the local bodyshop supply house, they have the stuff to repair urethane bumpers.
From: Should this thoughtful, valuable contribution meet with no acknowledgement or 'thanks' this post----
Covers are plastic, not metal, and the tabs on the early ones break off very easily...later models have thicker, beefier tabs but I am not sure which year GM finally improved the design. BTW, the used ones hardly ever show up here....I waited 3 years to get a torch red one before I finally lucked out. On ebay Butler Chevrolet sells unpainted ones for $160.00 ....not sure if any of them have ever had a buyer, but they keep listing it. you would be better off repairing and repainting yours...my dealer charges only $50 to repaint small items like this...best of luck to you