Back to the PO1 vs PO2, I found an interesting article in the Oct 1967 Popular Science page 102 showing a car from, no doubt, early 68 that the PO1 had the recessed outer ring, like the later PO2s. They were not that concentric outer ring on the same level as the inner ring as sometimes seen. That was how some of the early sales literature depicted it. Those renderings must have been concept drawing from Chevy, like the blue car on page 10 of the 68 sales brochures. This Popular Science site is a super cool, showing all old Popular Sciences mags. http://www.popsci.com/results?query=Sept+1968
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