So how does this work exactly? Do I need to call and schedule for my 2008 E350? I can't imagine they will carry hundreds of replacement airbags on hand at every dealer?

Is this also every single E-class in that year range or does it depend?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k