I think Tenrocca's right about Aussie made cobras and hardtops. DRB had one I think but not sure about what they're doing now.
Backdraft Cobras out of the USA/SA do a few hardtop versions to fit there various models.
I've actually been trying for about 18 months now to get a "PRICE" to buy one one off Backdraft but the response to even get a price ex-USA is as good as the front RHS fender on BDR 00. Hopelessly Roooted!
I've given up trying now.
Spookypt