I dont know the answer to the first question.
I would think that a bunch of engraver shops would have stamp kits. I dont know how hard it is going to be to find a stamp set with the exact font. For mine...i work in a dental lab...I will be making a wax negative and making a mold for my lettering and numbers from my old plate. I will cast it in metal and have the custom stamp that is an exact match from my old plate. Or you could just have a trophy shop engrave it. It will look almost too perfect, but not a bad last option.