The Cragar 09090 S/S cap should fit. It's steel, and held in place with a disc that creates an interference fit on the inside of the wheel hub and is held in place with a screw.
All the pictures below are for Cragar G/T wheels. They're the painted spoke and polished rim version of the S/S, so they're very similar. They're my favorite. I had them on my Road Runner back in 1980.
My spare modern (now discontinued) 610G wheel. G is for grey, as the C is for chrome on your wheels. Your hub should measure 3" here also.
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With vintage G/T Cap in place.
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I.D. of vintage cap.
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Reverse of vintage cap showing retaining plate and screw. Note the hole in the plate that lines up with the stud on the cap to keep it from turning.
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Modern G/T caps. They should have red paint. You'll want S/S because your wheels are chrome.
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