with that combo, you will be just like normal US cars except for having the outer light has a orange turn signal instead of a clear one. I just looked at a late 07' we have here in the shop, i can see the balast module on the outter tail light. the Euro lights I installed did not require this. the plugs on the(one in the shop) are different from the one i installed. Either EURO taillights should have the correct plugs and the US inner should have the correct plugs for both inner and outer lights on an 05'. on the inner tail light, it just has an LED ground, LED Low(running), LED High(Brake light) and then the inner light for either reverse or turn. and that one just has power and a shared ground. take pics of both your 05' lights and the LED lights you want to install and ill see if i can come up with a wiring conversion just by looking at the pics.
EB Turbo