ISO Cabinet Drawer for 173

It is called, appropriately enough, a drawer slide. Are you sure it is broken and not just badly adjusted? If they are not parallel, but wider in back than in front, it won't work properly. On my 179, one of them was mounted wrong so that the drawer face was not lined up with the cabinet when it was shut. I had to move the mounting bracket that was against the back wall.

If you are sure it is broken, is it under warranty? If so, then it should be repaired under warranty. If not, then Lowe's and Home Depot sell drawer slides. You would just need to get a matched set with the same extension as the existing slides. Some extend farther than others. In my 179, they pull out enough that there is a sizable gap between the drawer and the cabinet. The stop that used to be on the drawer would prevent the drawer from sliding out fully, but it was more of a hindrance than a help, so I removed them.