Various AMG wheels will work. If you're not against using spacers, your selection expands greatly. Front fitments whould have a wheel width narrower than 8.5" and an offset between +35mm and +30mm offset. Mine are 8.5" with +32mm offset and the fit is perfect.

Rears can be as wide as 10" as long as your lowering isn't extreme. OEM suspension allows more room for error. Rear offset should be as close to the OEM (+22mm) as possible. Many Mercedes/AMG wheels are 9.5" wide, +35mm in the rear. The new C63 AMG has insanely shallow offsets... +45mm IIRC. +35mm with a 10-15mm hub-centric spacer (eibachs are best) will bring you back to OEM fitment.

The only rear AMG wheels that will work without spacers are SL and CL fitment... CLS *MIGHT* fit... these are +25 offset and normally 9.5" wide. SL63 wheels are gorgeous and are 19x9.5" with +25mm offset.

Majority of other AMG wheels are shallower offset (>+35mm)

One other thing to keep in mind, is the bolt size. Some of the bigger Benzes use 14mm wheel studs, while we use 12mm. Replicas normally cure this issue, as they will make SL reps in a 12mm bolt fitment. Be sure to check and see if they use ball-seat lugs as well, otherwise you'll need new lugs.

My Mandrus wheels are built exclusively for Mercedes cars, and they utilize a 12mm cone-seat lug bolt.