I can't answer the second part of your question, but should be able to get away with mounting the plate to the parts car bumper. You might find it looks better if you get a frame for the plate.
However, the dimensions of the molded plastic "arms" are different dimensions than those of the original. Additionally, the crease along the steel bumper is in a different location from the original, so you won't be able to swap out the old for the better condition unit.
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