Good Day Gents,
There's 19inch CSL 1M rep mags and tyres for sale on Gumtree, Front: 235/35 R19 and Rear: 265/30 R19, however they rub against the fender archers on the 135i.
With the 225/35 R19 and 255/30 R19, I'm not to sure if they will rub, however you might just get a stretched look with the 8.5J and 9.5J mags.
Post pics if you do decide to go ahead, I have posted pics below of a 235/35 R19 on a 8.5J and 265/30 R19 on a 9.5J which looks like its slightly stretched.