The last time I had bumpers straightened and re-chromed was in the mid 1980's at a place in Orlando called "Florida Bumper". The bumper shop had molds of bumpers and they would press the bent bumper between top and bottom halves of the mold and straighten the bumper back to its original curves.
If you can find a bumper shop that has been around for fifty years they probably still have their old molds.
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