I have never seen an original 68 with that base you have pictured on the left. See post #7 where I posted pictures of an original from a 30k mile car. The grey reproduction certainly looks closer to the originals, but it has some flaws. Anyway how would you insert a trapezoidal shaped jack into a square hole? The jack you have looks to be correct. I have a total of 7 original 68 GTO jacks and they all look like the 4 I posted in post #2.
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