Rota grids 7j on Polo 6n2?

As it states, I am thinking about sticking Rota Grids on my 6n2, and I want this same
wheel  fitment/ placement or at least similar.  im currently on 15x7s (I think, possible that rear are wider, not 100% sure) however I am not sure about the ET.

so what I want to know is if anyone has put rota grids 7js on a 6n2, how different they will line up compared
to my current rims. or is it worth looking into doing 7s on front and 8s on rear?

I Looked into 8js,  they sit nice but apparently effects the ride, I currently enjoy the ride on 7js despite the height
and would like to continue to as this is my daily.

Any input or suggestion appreciated.
Cheers.
 

Edited 18 July, 20197 yr by x804_charlie