American Style plates?

My Dad has just told me that he has bought one of these (In fact this may even be the one he's bought!)



And I thought that i'd get him a pair of US style plates for it

Can anyone help me out where to get them made up? I can find websites that do Plastic ones that are the US size and I can find sites that will sell used or replica US plates

But I can't find a site that will make proper pressed ally ones to my own spec's

Any help would be great!