not sure how readily available these are?
but i may be able to get hold of a few jus like the one on the white e90 335 in the first post.
referred to as BMW 3 Series E90 CSL 3D Type Rear Spoiler.
I've got a sample on order so when I receive it, will check fitment and quality.
its made from plastic as opposed to fibre glass too!
any interest drop me a line.