E500: No rear power-sunshade with Pano-Roof??

I was just checking the options and packages of the E 500 and was wondering if I could order the eletric power-sunshade (rear-window) and the manual blinds (side) along with the Panorama-Roof. According to the brochure, I can't...
Why should it be impossible to order those options AND the Pano-Roof
I found a rear-sunshade and side-sunshades in the "Accesories" of the online-configurator. What kind of blindes are those? If I can't order those factory-installed blinds, can they be retro-fitted by my dealer?
Your help is appreciated and thank you in advance!
Anyway, I do also have the parts department ordered rear passenger side sunshade blinds but because it is winter and we have so little light anyway in the wnter months I have yet to install them. On the plus side they cover more window space than the factory roll up ones do.



