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You could probably buy a roof rack or one of those gizmos that attaches to the trunk/rear bumper, but I would recommend against the lattersince it may scratch the paint.
I have a 2006 GT convertible vista blue. I use a Saris Bones 3 bike rack. Attaches easily to trunk, fits over the wing and is easy to load bikes. Also once the bikes are off I can still open the trunk. They even have a matching blue color.