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A few years ago my right quarter panel took a rock hit, now small spider cracks are forming, I asked the bodyshop guy at the dealership and he said with the labor involved, it would probably be cheaper to just buy a replacement and have it painted. (He didn't give me a price do do this)
I have small crack in lower quarter - cost to remove bumper, patch the crack (about 1 inch) and paint was about $500. I would suspect replacing quarter would be significantly higher.