09 Yz450f spark plug socket

Can anybody tell me what size spark plug socket I need for the plug on my 09 yz450f? I need to buy 1 but have nothing I cam get in the hole to Chevy the size. Thanks heaps guys!

5/8 or 16mm fits the plug. Motion Pro makes a real nice one that comes with a wobble extension that is thin walled and works great.

Thanks Hoosier. Appreciate it!

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