By "crankshaft" do you mean bottom bracket ? Your second photo seems to show the left side bottom bracket cup not fully seated in the frame. As to your chainring bolts being loose, that could certainly cause noise. Perhaps you just need shorter bolts so they will tighten fully. Did you originally have an inner chainring that you removed to make it a single speed, and reused the original bolts ? Your Dura Ace crank arms are probably not the cause of the noise, so replacing them will not solve the problem. They are top quality, so I would not replace them.
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