
I got this done at a standard trophy shop / engravers. If you can get another plaque to take to them to copy they could make you one. Alternatively there are blank plaques sold on ebay, worth searching french ebay for them. They come up every now and then.
I could get one made from the place i had this made if you like? Cost would be around 25-45 quid i would say but would have to speak to them first. I paid more for mine but they will use the same design so copies will be less.
Its not a perfect copy as the originals are painted and this is brass, so its more shiny, but its far better quality, just not oem.
If thats not your thing you could always buy a plaque off another car and use that.
Let me know.