Which alloy wheels for Vivaro B

Hello I have a vivaro b bj. 2016 and think about buying other summer complete wheels as standard I have 215/60 r17 on alufelge 6x16x ET 50 that I now have a different punch drive than with the previous one I already know.(5×114) I would be interested in which wheel tyre combination (wheel widths, rim widths and press depths) I can drive or get registered without changes on the vehicle. 17 and 18 inches I think on 225/55 r17 or 235/50 r18 245/45 r18 is rather unlikely without changes to the vehicle I have looked at various internet pages and in many reviews stand on issues concerning changes to the vehicle inside. I know but of other vehicles I had not to have much to say. many thanks in advance