Assuming that you are talking about a 2.0L, the wider that it is recommended on the 8"x19" wheels is 245's. Both 40/19's and 35/19's are OK to use on the 4 wheels. I think the 40's look better but, that's subjective. The OEM staggered configuration has 9'x19" wheels in the back but, 255/35/19's not 40's. My reco: 1) OEM staggered configuration (you need to buy new rear wheels) or 2) 245/40/19 in the for corners on current wheels.
Almost a QV OEM wheels configuration. I know a guy with a 2.0L and QV OEM wheels configuration and he is happy with no rubbing or touching anywhere complains. In that case, as you already have 10" wheels in the back, I would recommend the QV OEM configuration of 245/35/19 and 285/30/19. As shared above the 8" wheels are not recommended with 255's (max. 245's).