
Most of the SMD LEDS on the 999cc Fortwo are PLCC-2 (TANTAL/B) and they
are a very common fitment. Some of these are dome lens type.
Some of the fiments are dome lens PLCC-4, this is unique to the new smart.There are also some
much smaller LEDs being used. These are 0805 (imperial) or 2012 (metric) package LEDs.
This is where I got mine from, clicky.

Dome Lens Info
The transparent dome narrows the spread of light and evens out the brightness.
SMD Orientation
Like most LEDs, they only work one way around. Standard LEDs are marked
with a single flat edge and 1 shorter leg. The SMD LEDs have a recessed
triangle in the corner, these are marked as red in the pictures.
Soldering SMD LEDs