Was wondering if I could get the communities input. I have a 2020 C43 and the car's stock rims and tires are:
Front: 225/40R19 93Y 7.5J ET33
Rear: 255/35R19 96Y 8.5J ET52

I have a set of winter tires and rims that are all:
245/40R19 98H 8J ET35

After using wheel calculators, it seems that I will need 20mm spacers for the front.

Is it a bad idea to use these winter tires and rims on the car?
Should I get a set that better fits the car and not have to use spacers?

Thanks in advance, here's what the rear looks like.

You’ll be fine with that setup and may not need spacers.