Gents,
This is a steering lock for the 230SL/early 250 SL up to VIN 002979,
one-sided key.
If you want to use it for a late 250 or 280 SL
you have to remove the lock assembly first (drilling out the bolts) and put in a /8 ignition lock instead.
The electric switch (not present on yours) can be exchanged between both.
Regards,