If you have 2 or 3 gear tracks (racks) on each end of the slide you probably have a Lippert slide. You will have to go to the coach builder or Lippert to get the racks and it will probably take a couple of weeks. You will probably also need a couple guys who are well equipped with RV tools and know what they are doing to install them.
Look closely at the teeth and see if they were fully engaged or just the tops were. From what I have heard most of the issues have been from not having enough tooth engagement which greatly accelerates wear and needs to be corrected by putting shims behind the rack.