Product review (4 stars): Not as clear as original but works fine
Original guide lasted from 2007 to 2013; this replacement was identical in shape but not as clear
A visit to YouTube helped me figure out how to get it to clip-in.  I had to take off the fascia, unplug the light, and unscrew the panel that was blocking my view.  Then, it was easy.  The whole thing only took a minute to complete, once I figured out the right way to clip that thing into the slot.
5 stars for being able to get a perfectly functional replacement part shipped so easily, but -1 for the opaque color (though it's not something that anyone would notice once it's installed in the fridge).