https://www.yenko.net/forum/showthread.php?t=141883
Others with more knowledge about the timeline and changes will steer you right. It has been discussed on this site.
Going by my faulty memory the square bars are the 1st style and found in ads around 70-71 then the rectangle type with tails, then a street version without tails. None of them are wrong for your car per se.
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69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979
FULL OWNER HISTORY
69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711
67 Super Stock 302 Camaro re-creation
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