Does every new car now sport the Aston's "letterbox" side-vent? I've seen them this week on:
And something that looked like a Kia
You can even buy them as stickers to put on your school bus or Vespa: www.harryshotrodautotruck.com/images/08-SV2-CB01on.jpg
I read an interview with Dave Brown in which he mentioned them appearing on Astons in 1957 to prevent engine overheating. Why did they go so long without being copied than suddenly they're everywhere?