Cabrio stalk number 001 2540 V004 C96A 00
Coupe stalk number 001 2539 V004 C96A 00 (thanks J500ANT).
Please be aware, this is only for smarts with a SAM unit (not 600cc fortwos).
Remove the 4 Torx10 screws from under the speedo pod.
Get your fingers in the front lip and lift the speedo up to remove, tuck it out of the way.
This is what you will find.