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I have similar wheels but took the dive and drilled holes. I installed coroplastic circles cut from a 4x8 sheet ($12 at plastic supply or more at sign shop) and installed with self tapping stainless button head skrews.They weigh nothing and are flush with the outer tire and the holes. If measured properly, they'll look as if they belong if you take the disks off.
If you do this, measure carefully and drill holes a little less than diam. of skrews. take 5 nails cut down to 1", wrap with tape till they fit snug in holes with pointy end toward you, center disk by sight and push till nails puncture back. Drill hole at punctures and install. Simple.
Took me 2 hours start to finish. Do they help? I'm sure they do. How much? couldn't tell ya, but for the time and effort, it's worth it. Plus you can draw a radical design on the caps. BONUS! and people will ask 'what's up with the caps?' and you end up meeting someone. Anything you do in the aero mod department will help.
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Mechanical Madness
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