Replacement fin for wind vane

[Tom1340]

Does anyone know how I can make a replacement fin for my data marine wind vane. The original part was a type of black plastic, about 1+mm thick. DMI sells them, but I'm having trouble getting a timely response from them. So, what would be a good material to use. I have a good pattern.
Thanks for ideas.
Tom

[Tenedos]

Do you have a part number?

[Tom1340]

Tenedos, I don't have part no. And I can buy the part from dmi, but they've had difficulty shipping out in time for mast reinstall. Hopefully it will arrive on time. But my question was about finding a suitable thin sheet (2mm) of rigid, uv resistant "plastic" that I could make a fin from.