I just went through this same dilemma. If you want to be safe and have absolutely no rubbing no matter what tire you put on there then go with the 10 mm spacer. If you want to take a chance that a wider tire like a Michelin PSS (wide) could rub in the future then go with a 12 mm. A 15 mm spacer will be right on the edge of what you can do without having to worry about running a size smaller tire, adding camber etc.
I chose the 10 mm spacer.
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