[Mason3]

In theory you can run 19x9.5 et45, BUT the tricky thing becomes tires. Because then you have to run like a 265/35 19 (A RARE TIRE SIZE ONLY A FEW PLACES MAKE), OR 275/35 19 which is too wide for my tastes when you lower.

Certain tire brands sidewalls are 'beefier' for lack of a better word and will rub. Not all the time, but sometimes (bumps, 4 people in the car, etc). Since this car is my wife's DD, I wanted to ensure 100% no rubbing, ever. She allows me to play as long as it doesn't inconvenience her! :P While rubbing may not be a big deal for some, she would freak out if she heard it when 4 of her friends were in the car!

So, the square setup made more sense for me.