Are you anywhere close to J9/10 M20? I have a good (I think they're staggered) set of genuine MB 16" alloys I'd sell at a good price, but would have to be collected - even come with a storage stand! They have winter tyres with good tread depth fitted, but the manufacture date is quite a few years ago so may not be useable! Think they're these : 16" Mercedes 7 Spoke wheels in 9765 Titanium Silver - Alloy Wheels Direct (106608) (ignore the price, I'll accept far less than that!!)
Can't pull them off the stand ATM, but from the listing when I bought them, part number A2044010202 7 1/2J x 16 ET53, tyres 225/50 Kumho Izen KW27's - but I think the rears are wider than the fronts so are possibly 8 1/2J x 16, trouble is with my health they're difficult to get off the storage stand to get part numbers etc. If you're interested I'm prepared to try!
If you are still looking I have a set of original Mercedes 17 inch alloy winter wheels and tyres for sale. Wheels are 7.5x17 ET47 Part No A2044017602 with Dunlop Winter Sport 225/45 R17 MO tyres. Two have 6mm tread remaining and two 7mm. They came off my previous S204 AMG Sport Plus. Being 17 inch I think they should fit over your brakes but you would obviously need to confirm. I think it is 16 inch that cause problems with the larger brakes. I can provide pics and full details if you are interested.