The sponsor is Europersona you can click the banner at the top of the page or click this link
Europersona. You can also post in the bimmer shop area. I have not seen the filters for DDE personally and the only smoked lights I have seen are either new assemblies, covers, or sprayed on tint. As for legality I think that depends on your area of the country but as long as your lights are still visible when on you most likely will have few problems.
Ben