Your going to need to replace the steering column. I had to do the same thing with my w124. Mine was broken because the PO didn't have any keys for it and had a locksmith destroy the column to remove the lock cylinder. Why not just order a new key? I tried and tried to get it to go back together with the cracked up column.... it just won't work. Mine looked just like that.
Replacing the column is not all that hard but it did draw blood more than once. Beware.
