This is actually the part you need if you are doing the sunshades, 54107198619. The repair kit you posted will have you replacing the "Rear Glass Mechanism", which might not be bad, but doesn't address the issue you have at hand.
The 3 kits are:
Sunshade - 54107198619
Rear Glass Mechanism - 54107227894
Front Glass Mechanism - 54137118849
When do you need what? The Front Glass repair kit contains the drive cable that has the infamous "Tab" which gets out of alignment. If the rear glass opens and does not close, this can be a fault point. The Rear Glass mechanism main components are the pieces located under the triangle "wedge" pieces. These have the channels which the tabs slide into, and move the rear glass forward (UP) and back (DOWN).