Here are the AutoID CF wings on my M235i 'vert - £125 the pair and full parts i.e. replacements, not stick-ons. Quality cf with full varnish so they don't yellow. They also do them in body colour or black.These are the simple style, as opposed to the M (which have that 'wing' on the body side).
There's a useful video on how to fit them. Took me about 20 mins for the first and 5 mins the second. I'd recommend winding the window down so you can rest the mirror on the sill rather than have it dangle by the heating wires.