I have used many different bulbs in my indicators. by far my favorite are the ones I have currently. the faux xenon tint bulbs. they glow very orange in the front when in parking light mode, a very rich orange that looks great.
The rears are the red ones.
You can use a standard 1157 amber bulb in the fronts no problem.
I have used the european and the us bulbs, either one makes no difference. its harder to find the euro two stage in orange at my local parts stores.
I'm happy with my setup now, and I've done blue, red, yellow, and clear in the front. I prefer the orange bulbs now, but the clears looked good too.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.