That's Roberts car. I think GM might have had two different vendors for shift knobs? Here is another persons opinion on the shift knobs GM used on 73 Z28s.
"FWIW that's the superseded 357703 knob- it has a smaller top surface- about the size of a quarter. The correct knob for 72-3 is the 6262364 knob that is so hard to find. It's top surface is larger- a bit larger than the size of a half dollar. Pictured is the 6262364"
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