Well, following your advice, I went to a dealership to get a touch-up paint. After a 3-day (!) search (paint no 751 alcott grey-REALLY ugly) they told me MB does not provide this paint in a spray can. They suggested going to a paint shop. Well, the car was already painted once (rear qtr panel collision), and the result is peeling and mismatched paint. Anybody out there knows of any spray paint that may match my car??