i think they are a real pain in the butt to come by i do however have a spare plug as my harness came adrift on the back of my unit and the empeg guys nicely sent me one.

Or you could ask the empeg team if they could sell you one but i don't know the stock situation.

I am in aberdeen scotland if that is on your side of the world.
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland