I want to make, or get hold of a sunshade for my 3-12 x 32 Viper Connect scope.

I've seen quite a few people using carbon fibre tubing as a sunshade on their 3-12 x 24 Connects, but I can't find any source of 43 mm ID tube to fit the wider scope. In fact I can't find a source of any type of suitable tube in this size. Anybody got any ideas where to find some, or any other way of doing it?

Cheers

Alan