Maybe it would be a good idea to post your own ad there, saying you're actively looking for a hardtop – someone might contact you directly.
And honestly, it might be worth considering some kind of compromise – that colour was really quite rare, so repainting or restoring depends on the purchase price might be a solution?
Also, keep in mind that there's an additional challenge: transportation. A hardtop is large and awkward to handle, so you’ll most likely have to pick it up in person anyway.