Well there are these :
http://www.dual-star.com/index2/Bran...ain%20Plug.htm or you could buy bolt pack Champion BM145 from Supercheap which contains 2 of M12x1.5 which is the KLR drain plug size. They are a bit long at 50mm but thats easily fixed. The head is about 2/3 the height of the drain plug, and could be reduced a bit more.
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