I think you're going to have a problem finding a roof rack. I have that problem to (I do road cycling)
As far as I know, since the camaro doesnt have roof ditch brackets, most roof racks "Clamp" on the roof ditch modling area to the underside-top of the door where the flexible rubber is.
The problem with the camaro is that the molding where the top of the window is not flexible, and you can't obstruct the area where the window indexes either.