Product review (4 stars): Good Rails - Fit Was Perfect with Minor Modification
Fit my Whirlpool refrigerator model GS5SHAXNL00...but not perfectly.

There are two little white circle bumps (shown in the blown up picture) at either end of this thing that don't exist on the original rails.

I had to cut these two off (I used a box cutter - I would recommend sanding them off with a Dremel) in order to get this installed.

Your model may vary a little, and might even need these - verify by removing your rail first.