There are only two, the fronts are conventional shocks. Typically as a rule of thumb, the accumulator fails the ride gets a little spongey, and then hard as all the gas disappears. They are usually less than $100 ea, two hours labor plus oil. The struts unless they leak dont fail early, but they have been known to wear the bushings, causing them to rattle. I would watch what happens but replace the accumulators when the ride gets harsh.