I've attached pictures of what our bottom-track-guides look like. They aren't rollers, but these nylon clips that appear to connect to a narrow channel, similar to the 23-241. In fact, the 23-241 looks very similar to the track I vaguely remember throwing away. Have you ever seen guides like this? If so, does the 23-241 work with them? Unfortunately I don't think I can remove them (and replace them with rollers). They are connected to the door with rivets and some adhesive.
