[f5fstop]

Rear taillight could be a bear to switch out; not the physical housing, but the wiring.
The US/Canada version has the BCM controlling the park/turn/brake lamps at each bulb. When you turn on the park lamps, the BCM energizes the PRK/LP relay, which in turn supplies power to the rear bulb. This should be the same in Europe, but CANNOT guarantee this since I have no European schematics.
However, the turn and stop filaments are directly controlled by the BCM. When you turn on a signal, the BCM pulses that circuit to give a flashing bulb, if you apply the brakes, the BCM closes that circuit to the other filament inside the bulb to turn on the brake lamps (turn signal will override the brake).
To install the European taillight, a new BCM would be required, OR you could do some creative wiring.
The park lamp light should be the same.
You could run a wire from the brake switch to a relay to energize the second filament in the rear red bulb to simulate rear brakes. (I suggest a relay as to not overpower the brake lamp indicator circuit that is primarily an input to the BCM).
You could then run a couple circuits off the turn signal indicator circuits to relays, to energize the rear amber turn signals.
The turn signal switch signal the BCM via a resistive type switch, similar to the old cruise control switches. One resistive signal says right, another says left. The BCM does use two separate circuits to the turn signal indicators in the I/P cluster. (I tapped for the turn signal mirrors I installed on my H3 into these wires.)
I believe running the separate wires, using relays, should enable you to run the European taillight assembly.

The front turn signal lamp assemblies should be available at a European Hummer dealer, and the side repeaters should be available. Not sure if someone in the states could obtain these items or not, possibly partsguy.