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Not really a tool. Just use a 8 point 14mm(I think it might be smaller). The 8 point is thin enough on the side to fit.
The R56 plugs require a special 12pt socket.
yamaximka: if you lived closer, I'd gladly loan you mine. Just bought one about a month ago when I changed my own plugs. Maybe check a nearby Sears....they sometimes carry them....will likely be close to $30, though. If you end up ordering one online, Waymotorworks had it for around $15 as I recall (great price).
A deep socket will work and you're right my info is a little off I just couldn't remember the size but, I did remember it was the high point one. Harbour Freight is where it is at.