We carry standard steel track sections, roller brackets, and nylon and steel rollers on the truck, since those cover the bulk of what fails on doors from the late 1990s build era common here. What we don't always have on hand is a match for an odd-width or custom track profile from a higher-end original installer - those sometimes need an order, and we'll tell you up front if that's the case rather than installing a near-match and hoping it holds. One honest limit: if the door itself is warped or the panel seams have separated from the stress of running off-track for a while before you called, straightening the track won't fix that, and we'd rather tell you a new door section is the better money than patch a door that's going to keep giving you trouble.