I would have thought that the 6" size would have been closest to the original JDM size, would obstruct less of the air intake too. Interesting that they've given you those options, when I imported and registered mine the only size I could get was the standard 11" x 8" British "squarer" plate.
I can't find the ones off mine, so did a bit of research and it seems that 6.5" is actually the norm , though they can vary a bit. Just make sure your characters are the right height, see here: The Legal Sizes For Import Number Plates DVLA Confirmed
Interesting, I might get one done myself, currently I have a UK standard 11 x 8 plate which obscures a lot of the intake.
Good point Fivos, really needs some sort of spacer to mount securely but obviously the way to go if you think cooling may be at a premium > However I'm sure some will wan the authentic JDM look!
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