The body sills they refer to are what we call rocker panels which are under the long chrome "spear" that runs along each side of body. Most rally sports and SS camaros came with it with the exception of dark color cars I think. rick
If you look at your trim tag it should list your car as an X-11, X-22, or X-33. X-11 is much more common. This X-11 indicates the RPO Z21. The Z21 is a exterior trim option. It includes the black rocker panels (depending on the color of paint). Only the dark colors did not recieve black rocker panels.
I suggest checking out Http:\\www.camaro.org for a complete listing of Z21 equipment.
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