Cragar SS Lug Nuts for my '66 Barracuda

I looked at the wheels and the mounting surface looks flat. There seems to be 2 washer options and one is tapered but doesn't look like I would need those. Correct?
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I can't answer that. I didn't know there were tapered washers available. Get the correct ones that Cragar recommends. Now, looking at the photo, if the mounting surface around the lug nut hole is the same dimension, I would think the flat washers are what you would want.