David -
Try Parish - they write a lot of Cobra replicas.
Parish
Phone: (800) 274-1804 (Tennessee office)
They are being much more selective on Cobras nowadays, too. The forms I had to fill out for my last renewal basically asked for a "resume" of my experience with high-performance automobiles, including what type of car, how big an engine, how long I had owned it, and how much "open track" or performance driving training I experienced.
They also offer a significant discount for an "on-board" fire system (the discount is nearly enough to buy a system).
Good luck!
regards,
Jeff Burgy