Product review (3 stars): OK, BUT--  requires a little hand-modification as others have said!
Just as other reviewers said, if you take the time to remove the 2 unnecessary round extrusions (one at each end of the track), and apply careful, firm pressure to insert the track, then these tracks DO fit. Make sure you check your model of fridge! I used wire snips to cut off the 2 circle things that prevent the tracks from sliding into place. Then, as others said, I used sandpaper to further make those two areas nice and flat- the plastic is relatively soft- easy to sand. Then, position the plastic track at the slots of your metal shelf supports. (pre-remove your glass shelf with its 2 metal supports attached to it, and place the shelf upside down on a flat table or surface, to work on), And, if needed, use a small screwdriver to push the plastic tabs gently into their metal slots, while you slide the track in, at the same time. One of my 2 tracks also needed a careful tap with a rubber mallet to force it into place. Then the tracks went in with a reassuring click. I can't figure though, WHY the manufacturer took the time to mold & cast these replacement parts with the 2 unnecessary round extrusions that just don't go anywhere, and need to be manually removed. Be prepared to do the 10 minutes of hand-work!