Ok, I've spent a while searching and I'm more confused now than I was, lol. Here is my setup

275/40/18 x 9.5 Offset: 35mm
245/40/18 x 8.5 Offset: 30mm
Eibach 1in drop all around (within spec)

What size spacers do i need??? I'm thinking 20 and 25 but I'm just not sure. I don't want to roll the fenders. Thanks for the help.

 

you'll be fine.

 

^Well, thats good to know but will this give me the "look" I'm going for?

 

well, they'll push the wheels closer to the fender, and not require fender rolling. If you want to do math...

I have 245/18/40's all around. My wheels are 9" 21 offsets. I'm dropped an inch and a half. My front spacers are 15mm and rear are 20mm. They look great and require no rolling. I could easily push out the rears another 5-10 mm's, but may need to roll if I get wider tires.