ET25 9.5" all around would look pretty good I think. pick your diameter from 19 to 26's, lol. I bet the fitment for F30 BMW's would work (20x10 square ET30) with a small spacer up front on the pre-refresh cars, or probably no spacer on the refresh cars. Refresh will need more like an ET30 probably, it's ET40 front and 35 rear I think
Both are pretty tucked in from the factory, pre-refresh is 9" ET35 up front, 9.5" ET40 rear. People have done 10's up front and 11's in the rear for sure
TE's would look awesome on an X. Obviously. Everything looks good on TE37's. Don't tease us, make it happen