Audi A4 Allroad B8 wheel query

[notax]

I am about to take delivery of my second A4 Allroad and this time Im looking at fitting either different 18 or 19 inch wheels. I’m also likely to fit HR lowering springs to take it back to the A4 ride height. Does anyone know which offsets I need to aim for? Keen to fill out arches without spacers and without rubbing. Any photos of similar cars appreciated…

[RammyMP]

Is this website any use: https://www.wheel-size.com/size/audi/a4-allroad/20...

I used it to work out if my A5’s winter tyres would fit on other cars. The offset is different between A4 and A5s.

[notax]

Thanks, that is helpful to an extent. It shows the ET26 is the same on 18 and 19 wheels, does anyone know if this differs with wheel width? Ie if I fitted a 8.5 x 19 rather than the stock 8 x 19? Also keen to fill the arches better so guess this would involve a different ET again…?