Update - I got my OXM parts and replaced the washers on my 2011 Juliets. Being my first time, it took quite awhile to get them in, but it worked out great. I was very surprised to see that there were 2 sets of OEM washer on EACH SIDE of the ear stems; so 4 total washer PER side. As people have noted, diff generations had diff fitments, so they must just have one type of washer and double up on the required frames.
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Actually all X Metals have two on top and two on bottom. That way you have two of them always rubbing on each other and it makes the arms work better.
I would definitely use four thin ones over two thick ones on each arm.