The green are a excellent upgrade from stock, the red is a step up with a little bit less dust and better hot friction. Yellow is your choice if you plan on taking your car on the track, the other two are not suitable for track use. The green are semi-metallic and the reds are ceramic.

Should be ground (brown), +12v (red/gray), and a "signal" from the momentary switch that is also +12v (solid red). On the wiper with 4 pins, the 4th pin (black/yellow/red) is the output signal to the second washer fluid pump.

According to my tests of over six years over five cars, Dex VI (Valvoline Red) is good for 722.3. My initial test results of the cocktail with dual clutch: even better. Why MB won't approve the use of Dex III or other fluids for 722.3.

The blue-green coolant is likely the current-spec Zerex G-48, which is what MB uses and specifies for engines now. However most of us use the "old" G-05 which is pinkish/brown in color and available at McFLAPS stores (AutoZone, Advance Auto, O'Reilly, etc.).

The green cylinders for K1 and K2 are available new, IIRC, but you'll need to swap springs around. The new green K1 cylinder comes with springs that are waaaay too soft for an M119 (think they are meant for a 722.4 with a low-torque engine).