Product review (5 stars): so far so good
I installed this two weeks ago.  All I could install was the strap that wraps around the heating element.  it took a bit of futzing around to get the long tail to go down the drain and it was a challenge to get the screw to bite and tighten all the way.  After a while I finally got it in and snug on the heating element.

The bag of parts has a lot of stuff that is used depending on which model refrigerator you have.  I could not use the cylindrical tub on mine but so far I'm getting water in my drain evaporation pan under the fridge so I know that ice is melting and draining for me.  So far so good. I plan to come back and post an update after several months of ice free defrost cycles and continued water in the evaporation pan.