I bought the factory part # rear license plate holder for my 2003 EC 300, but like any other I've seen, the actual mounting surface does not match the US-size motorcycle license plate. Sure, I can drill holes in my plate, but what do you dudes usually do? Here is a light/mount assembly from Amazon that I actually like better than the GG part, and I sketched in the problem as I see it:

What is the preferred method of mounting the plate?

What is the preferred method of mounting the plate?