Where can I get these, preferably a local source like Autozone, Advance Auto, Home Depot?. Broke off a quarter inch adapter socket trying to get the plugs off of my old heads. I'm going to try and drill what's left of the socket out today without destroying the plug itself, but I'd sure like to have a backup plan.

BTW anybody have the sizes of these plugs, thread type ,and the sizes of the tool to remove them? There are two different sizes as far as I can tell, and you need some kind of square tool to get them out. I'm going to try and heat them up as well.

Thanks guys, really need to have some help here as I'm hoping to be running in the GA F-body ShootOut this Sunday.

Thanks.

Mark.