i think they make a sleeve for the rear that you can adjust but im not sure. when i had all my suspension put on the guy said he'd throw the back in b/c its only like $30. but i know a bunch of people that just use washers in the back. i'd say that is the most common and when you get your car aligned, the shop will put those in for you. i think the only problem with washers is that when they go to readjust everthing all the washers fall out. thats not a big deal though