Spark arrester plugs - what size?

As I was doing maintenace today, I realized that the back plug was gone... so then I proceeded to unscrew the front plug from the stock pipe. Geez that went really hard and - not surprisingly - the thread got aten up in the process. I think that the plug itself took the majority of the damage (from what I can see).

My idea now is to find two new screws for the pipe. Anyone know how big the thread is? I am guessing it's metric like the rest of the bike. I guess I can try matching the thread with this chewed up plug but it might be better to find the real size so I do not screw up the threads for both plugs eh...

Note to self: apply anti-seize when screwing this back on...

And the answer is:

M12x1.25

I am 99% sure it is 1.25 anyway.

Now to find something short...

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