Well I made a pair of bc plates today and they are quite sexy.
Quarter inch thick, 7.5 inchs long, 5 inchs tall, and 4 inchs wide. They were made from some metal they had at a place that sells scrap metal in Ottawa so they already had a couple holes in them but they are still perfect. The guy there even let me do whatever I wanted to them to make sure they wouldn’t bend and I later put them onto the wheel so tight the wheel wouldnt spin then hopped on them a bunch just to be totaly sure.
Anyways here is a picture and if anybody is interested in a pair let me know and I can go down to the metal place again on monday or something and pick up some more metal. If you are interested they would be about 20 bucks (Canadian) which is cheap because the metal is useless to them because of the holes.
Also the picture is rather red and dark because I was just using a webcam but if you are interested in getting some I will get some real pictures up later.
I remeasured using a more precise method (using an adgustable wrench) and they seem to be 12 mm so it would appear that you are correct. Either way its close enough for now as I can’t go further than ten feet.