First off if you search, you'll probably find a ton of subjects on this. If you only go with an inch, you may not even need anything. If you go more than that though, you'll need the bolts for further adjustment. When I ordered my springs from Eibach, they included them for free. SO I don't know where to tell you to get them. Also, if you go 2" or more, you'll probably have to get the Hotchkis links for the rear. They are expensive, but not as expensive as 2 sets of tires. They are worth it.