You might try using part number 3996286 to search for the earlier style. They sure aren't worth $500, but tough to find NOS.
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Rick
69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.)
69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan
Don't text and drive.
Somebody's life may depend on it!