[Derek911]

Not being a smart azz, but instead of parts, the first purchase should be a good set of books. I am currently reading, yes reading like a book, Bentley's shop manual. Not to mention that I already read all of the other popular must have books. Answers and instructions are well documented in books, tech articles, and previous posts. To answer your question, yes they can be changed, as with all of the rubber and plastic on the car or new link parts installed or a new sway bar. That is up to you, your budget, and skills.
Everything you need is in the parts section of the host, simply looked up by year and model of car.