Are they staggered or 8J ET20 all round? Presume 17''?

You'd need spiggot rings to go from 74.1mm to 72.6mm
I'v 8J ET20 on the rear of my coupe with a 215/45/17 and it just gets away without rubbing. (Arches are standard!)

So a 205/45 should be fine on them without a roll, Possibly get away with a 215/45 depending how low you are.