I picked up a couple of neon signs on E-Bay, they are the coiled Cobra, and one says Shelby the other says Shelby Sales & Service. Just nice little wall hangers, but there is also one the has the older Cobra emblem, as on the AC Cobra mad says Cobra Sales & Service. The signs are cut into acrylic with a light shining down from above to illuminate the display. The most expensive part was shipping from Hong Kong.
They are illegal in the sense that they are unlicensed but not a bad little sign. I bought one about 9 months ago but I have no idea where I put it.