Ns3e

Will these E550 wheels fit a W203 with H&R sport springs?

Front:18x8 +50
Rear: 18x8.5 +54

I'm aware that I'll need new lug bolts and I don't know what else I'll need. Spacers possibly and tire width size doesn't matter to me. Thanks in advance.

MrVu

I believe the offsets are waaaay too high. The oem offset is et 30 front and rear et 34.
The wheels you've listed have a high offset and would not work on the w203 without huge spacers.

You need at least et 35 to clear the front calipers and around et30 rear to avoid hitting the structs.
So, you'll probably need a 15mm spacer up front and perhaps a 20mm spacer in the rear.