Hi Pablo. I think because mine is an early car, things are slightly different than yours but here's how mine stacks up:
On the data card, mine is in the #18 box -- entitled AufBau Nummer.
On the car, the full number can be found on a screwed on plate on the door jam and stamped on the metal shield near the washer bag. The last three digits can also be found on the upper driver's side corner of the open hood (bonnet), the upper most driver's side corner of the soft-top lid (when open), and on the hard top -- on the back underside near the center. (you can only see this when hardtop is off -- either upright or upside down...)
I cannot verify the transmission plate number as I've never seen that one.
James
63 230SL