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You just need shorter bolts. I'm pretty sure they are metric thread. If i were you, I'd try my local ACE or True Value hardaware store. Take in the longer bolts and the staff there should be able to help you. They usually have stainless cap head machine screws in metric, not so sure about black anodized.
Otherwise, you could try a dremel tool, cutoff wheel, bench vise and a steady hand to shorten them.
I was thinking that the sensors were just little plastic buttons that needed to be pushed out. It turned out that if I would have done that, I probably would have broken them, so I thanks to this article, I was able to safely remove my old bracket and replace it with one that has the Built-in plate holder. The finished project. I think it came out pretty awesome! Thanks again!