Re: 1968 Yenko Questions
14x7's weren't offered until '69 on any Pontiac. Those appear to be 14x6's and per Paul Zazarine's GTO resto guide, '68 spec Rally II's should be code JA (p/n 9787279) for disc brake apps and code JC (p/n 9789329) for drum brake applications. I wouldn't be surprised if Yenko offered them sans trim rings that year, for the reasons outlined by the other posters.
TOM
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