350 v 550 rear valance
you're talking about the rear difuser. it's a totally different kit than the elegance model

I don't know if, or think the parts are interchangeable, but your bumper should have an outlined "area" (not sure if the Coupes do) where the black would be, IMO just get it vinyl wrapped or maybe painted if you want to go the more cost-effective route, otherwise I'd imagine you might have to buy a whole new bumper, possibly.
you got the elegance version of the car..
you couldve got it to look just like the E550 coupe, which is just the sports package bumpers.
your e350 and the one you saw are 2 completely different bumpers.
you'll either have to paint your difuser black or get the AMG bumper
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If your car does indeed have the *AMG* Package, then the only reason I can think that your car being otherwise aesthetically identical to an E550 Coupe yet without the black diffuser, is that they only do that to differentiate the V6 and V8 models. If that's the case, than it should be easy to paint that outlined area black, or get it vinyl-blacked, etc.
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