It's E320 or E-class, BTW. 320e sounds like some inferior marque's nomenclature.
Welcome. You just found a way to save thousands of dollars on MB parts (Fastlane, click above) & repair! Using my wife's logic ("I just saved FIFTY DOLLLARS by buying this on sale!") I have already "saved" enough to buy a 17" laptop, a chip for my Passat, etc.!
Congrats and good luck,
-Tom