It has been a very positive experience adding euro-spec rear fog lights to my 540 (in case you missed it see link). Now I am ready to embark on adding other BMW options that are not offered in the US. These are the options I have earmarked:

-drivers side storage compartment in lower dash
-electronic damping control (EDC)
-air suspension (rear axle level control)
-servotronic power steering (speed sensitive)
-auto dimming side view mirrors
-latent heat reservoir (heater works immediately, even when the engine is cold).
-in dash CD
-dual glazed windows (reduces moisture buildup and road noise)
-double vanos
-headlight washing system
-comfort close (can close windows remotely using button on key)
-rain sensitive wipers (not offered in US in '98)
-xenon HID lights (not offered in US in '98)
-electric rear sunshade (option I now want)
-heated seats / wheel (option I now want)

The goal is to use exclusively BMW factory parts in concert with factory workmanship. Should I have success in adding such options, I will document each procedure carefully just like the rear fog lights. What I need is a parts catalog, shop manual, or any other documentation to determine parts / wiring / procedures. If you can point me to any sources of such documentation (books, CDs, online, etc), I would be greatful.