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This happened to my car as well. Since the bumper is aluminum and the mount is steel, it's just a matter of time before galvanic corrosion sets in. In my case, I fixed it by attaching a foot-long piece of steel bar stock (about 1-in wide) horizontally across the rusted-out part of the bumper. The bar stock is attached at both ends with bolts. I drilled two holes in the middle of the bar (aligning these holes to the hole in the bumper mount) and then fastened the bar to the bumper mount with the original bolts.
Good luck,
-dave
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