Again, unfortunately, a US dealer is not going to help you here. That plate bracket is an overseas spec one by its shear width. I mentioned I already tried to get some parts that were specific to overseas C-HRs with a US dealer. It was a no go as they don't have the parts catalog to even look up the part number and they are not even able to order the part if they can even get a part number.
The US front plate bracket was already included with my car from the factory. It just wasn't installed. It was sitting in the trunk space where the spare tire is. I went back and forth on whether I was going to have the dealer mount it. In the end, I just let them do it instead of dealing with the hassles of potentially getting a ticket over it.
2019 Toyota C-HR LE Silver Knockout Metallic
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2004 Kawasaki Ninja ZX-10R Black