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Alright, so instead of waiting for answers in this deadass C207 forum lol, I decided to do some research and after couple bumps, I was able to find the bolt on fitment Front BBK for my 2012 E350 RWD coupe with AMG sports package.
No special bracket required, cost was quite cheap IMO, and clears factory 18" AMG wheels.

There are known options for E550 coupe, but no information anywhere online, for pre-facelift E350 RWD, at least bolt on factory, not aftermarket or using custom brackets.

Caliper is from 2014 CLS400/550, 4 piston caliper with 360mm 36mm fitment.
Purchased on ebay used with lines etc intact, for $400 delivered.
Pistons and calipers were ok, as the caliper was from a car with only 40k miles, but decided to replace the boots and seals since it will be rebuilt and freshly painted.

Now, the compatible 360mm rotors for this CLS400/550 caliper fitment DOES NOT WORK on E350, due to major difference in overall rotor height.
It wouldnt clear the calipers.

So after researching, I was able to find 360mm Brembo rotors for SL450/550.
This rotor retained 360mm x 36mm fitment needed for this caliper, and was the closest fitment to the OEM E350 rotors.
fills the ugly gap between the wheel and factory size rotor (322mm).

Brembo part number is 09.B474.11
$220 delivered for a pair.

They fit perfectly and i am more than happy.
They look almost as good as my 390mm 2 piece brembos on my W213 E63S.

In the next few days, I will rebuild, and refinish the caliper in Gloss Black with white "Mercedes-Benz" lettering.

Just thought I share this information, if there was anyone looking to upgrade the look of their brakes on their E350 RWD.