Yes you can leave the spacer out if you want to.
By lowering the inside ball stud I find it gives you a little more grip initially turning into the corner but the rear brakes away more violently/suddenly.
By raising it up it takes away a little grip but stays more consistent and progressive when it does break away.
For the wider front camber plates you will need turnbuckles about 50mm
http://www.racing-cars.com/pp/Old_Ca...iot/U3213.html
Mat