Don, Mr Yenko did in fact upgrade to the SS wheels that were also used on the 70 Chevelle SS. They used no trim ring and instead of a SS center decal they use a Y decal for Yenko. The finish would have been the same. The original "as delivered" wheels would have been a steel XT 14X6 body color painted rim with a dog dish hubcap. Attached you will find a pic of Marlins Deuce in the "before converted" configuration.
Joey when I look at the pictures the more I can't wait to see her in person! BTW I LOVE the Lustine dealer emblem. Hell the memorabilia KING should have an emblem for the dealer that his own SUPERCAR came from........If I only had some Loehmann items!