Spacers with stock 19" wheels

Hi everyone,

I've searched extensibly about this topic but have not been able to get a clear answer, so here it goes.

My first child was born a couple of weeks ago and I decided to trade my beloved E63 6er for a 535i with the Sport package and 19" wheels running 245's in the front and 275's in the rear. In order to get closer to the sportier look and feel of the 6er, I ordered a set of AC Schnitzer springs that will be installed next week. Since I will keep the stock wheels until I make up my mind about which wheels to get, I want to get spacers to push the wheels closer to the edge of the fender line. With the staggered stock wheels, how wide a spacer can I use in the front and rear WITHOUT causing ANY rubbing at all? Keep in mind, I did not buy the X Drive model.

Thanks so much, I appreciate your help.

jo