I'm in the process of removing the head on my 602, and I need the socket used to remove the 12 spline (I think, didn't count) bolt that attaches the cam sprocket to the camshaft. I've searched and can't find one for sale anywhere. Is this something I could get at an auto parts store, or do I need to order it? If so, any idea who is selling one?

The head of the bolt says "KK 10.9" if that helps....