I don't know if FastLane carries Euro lights or not, but they would be worth a try. If they don't have them, then Impco/Performance products in Van Nuys (1-800-243-1220) shiuld have them for about $475 per set, which includes replacement indicator lenses (as do most of the vendors, for some strange reason).
On line, the best articles on aiming and wiring are at:
They carry the lights, but you have to email for prices, I believe.
Other on line sources for Bosch/Hella units are:
Used units taken from German 300Es are often available from:
They were about $300/pair, do not include new turn indicators, but usually have the vacuum servos for adding the in-car leveling control on the dash - An article was in the Star magazine a few issues ago on these lights as well.
There are lots of installation instructions in the archives, this is a pretty simple DIY project, especially if you don't care to keep the headlight wipers.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E