BTW this site
mentioned by Red has multiple entries for passenger cars. Just "Mercedes Benz" finds SLK recalls and then you can choose both "SLK" and "SLK-Class".
Airbags are lines 13 and 14 here
. Note - had to use "all models" and search for "air bag". "Airbag" (no space) gets a different list.
I find it much easier to enter my VIN at the MB site.