headers "looking for the caps to block the air system"
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I got frustrated looking for the metric plugs and ended up forcing in some standard plugs with a little jb weld for good measure. I called every hardware and auto parts store in my area and no one carried anything that large in metric sizes.
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I just recently did this and I couldn't find a metric plug anywhere. Checked out Lowes, Home Depot, Advance Auto, and Ace hardware. I ended up getting a standard brass plug with a square head from Ace hardware. I cross-threaded it in with RTV on the threads. It felt like it wasn't even cross-threading cause it went in soothly.