Yes +35 will stick out more...offset refers to where the mounting flange is in relation to the rim...so a rim with 0 offset would have the mounting flange (part that bolts against the car) in the center of the wheel.. as the numbers move to the + side the mounting surface moves toward the outside or face of the wheel and this brings the wheel closer in to the car...as the number get lower and into negative offset it will push the wheel out more (think of the deep dish style wheels)...also you can do a Google search for wheel specs if you know what year the mustang is...and keep in mind that the rav is hub centric and the hub bore on a mustang is not likely to be the same as the rav...