I knew about Donohue running the 4-lug pattern for part of the '70 season but had not noticed any of these plugged Minilites being used on current vintage race cars. Cool picture. Thanks for posting it. The Bud Moore Mustangs did run the 200-S wheels on the front at Laguna Seca late in the '69 season so I'm not sure what they were thinking with regard to choosing between them and the Minilites.
As for the S in 200-S standing for Shelby, I never heard that story. However, the "Libre" wheel that was made by American Racing was kind of a junior 200-S but with 4-spokes instead of 5. These were meant for smaller cars like Datsuns, Triumphs, etc. Some of these "Libre" wheels had the name Shelby cast into them but these were Shelby copies of the American Libre wheel. Just taking a wild guess, it could be
that some people have seen the Shelby name on these 4-spoke wheels and somehow associated it with the 200-S.Libre mag wheel