Phil,
the reason why I showed that pic was that I thought it COULD be a COPO-spoiler, that had been remowed from a -70 Z and put on this -71.
I didn´t get a chance to look under the hood, so I don´t know if this was an Antwerp car. A friend of mine had a -71 Antwerp-built Camaro that was fitted with the small -70 spoiler by the factory.
I´m still curious, is this a typical 1971 spoiler ?