I may have mis-understood.
I thought Botak wanted to buy "USED" German License Plate.
Malaysian License Plate have to conforms to specific Malaysian Standard, ie the font size, font type, font colour-white, black background, etc. The font also have to be embossed or raised ... but nowadays I have seen many plates with stickers only, that is the font is almost flat on the background. Those silver or gold colour fonts are also not allowed.
"USED" license plate can be bought at the flea market in Canada and USA. I think the same should apply for German USED license plate. I got a collection of USA plates from my cars and those I swipe at the junkyards. In the States, you can just walk in to the Public Service Department (in Texas .. other states may differ) and buy a new license plate to replace the one you have on your cars. Anyway once in 5 years you will be required to replace them as the reflective paint become less reflective. I do not know whether you can asked for the same number though. Well maybe you can, because there are a lot of those personalized license plates... you may have to fork out some additional money though.