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How can you tell that the spoiler is an add on?
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The spoiler package was developed during the '67 Z/28's development. Pre-release press and factory photos show the prototype Z with a flat-back trunk spoiler. My best information, which I read on the Camaro Research Group site, is that spoilers became available over-the-counter at the very end of 1967 model production. Yes, currently-available 1967 assembly manuals do show spoilers and how they were mounted, but remember that the manuals were constantly being revised and updated. The reprinted 1967 manuals you can buy nowadays are the 'final' fully-revised versions from the end of production and that's why spoilers are listed. When I see a 1967 Camaro with spoilers I always think "spoiler abuse." Because the 1st-Gen spoilers look so good, they get affixed to darn near every 67-69 car, even 6-bangers. It's refreshing (IMHO) to see a '67-'69, especially a '67 performance model (SS, Z) with no spoilers. BUT, if I were looking for a '69 Z/28, I'd want spoilers.
I went off the top of my head with this explanation and I welcome further clarification and/or correction!
