Blue painter's tape would work well for that also. As a general rule the window will drop into the door cavity with the "bottom" of the window facing the front of the door. Once it's in past the door frame it can be turned to the correct orientation in the window channels & fastened to the regulator.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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