Broken Armoire drawers

Post D92: I wanted to add that my metal tracts are just open channels(U shaped) and not like the white tract you show with a stop screwed on it. Im worried if I buy the Kenlin socket and stop I wont know how to install it and make it work correctly. My socket and stop are the numbers I gave in my first post D92 Kenlin brand. I know how to change out the socket with 2 screws. But how does the stop fit exactly and is it free sliding or screwed down and where if screwed down? Thanks