Most people just buy extra's to keep with them so you do not have to worry about not having a part if it breaks. Like I think was posted earlier, If you are going to race then get a couple sets of a-arms, shocks shafts, rod ends, shock shaft ends, hinge pins and rear uprights and maybe knuckles and you should be fine. Sounds like alot but it's really security knowing that you do not have to worry about having to go somewhere if your truck breaks, you got the parts right there.