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These first one you posted pics of is the one you want. Wide Tread, NOT POLYGLAS. I agree 3/4 of the restored 69s you see have Polyglas tires on them, (either that or the 70-up style Wide O Ovals) but that doesn't make them right.
PS... Z/28s had E70-15 Wide Tread GT's or Firestone Sport Car 200's.