If i remember correctly it was the exact same bulb. Wasn't aware of the filaments.
Yes the whole left side, front and back signals dont work including the blinker right beside the front doors. No warning signs either
If the bulbs on the entire left side of the vehicle aren't illuminating...AND...you're not getting a warning from the check control system...something serious is wrong.
The LCM (light check module) controls all the exterior light functions...and it also is where check control warnings eminate from. So if you're not getting a warning...that means there's an issue that may go all the way back to the LCM. The LCM also monitors all of the vehicles bulbs...it does a cold and hot check. So if the lights on the left side of the vehicle aren't illuminating...you should be getting warnings.
The LCM is located in the right front passenger foot well...on the exterior side. Have you had any water issues on that side of the vehicle? If so, a wet LCM has bedeviled many a BMW owner.
Below is a brief history of the LCM: