Door glass and vent window install as an assembly. Glass slides into track of vent window from bottom up.
Then I sugesst 1.5-2" blue tape in all areas that could chip. Best to install with 2 people.
Make sure you have new vertical glass run channel. This is the piece that installs on the door glass and goes against the vent window with the 2 plastic glides and a pin that goes thru a hole in the glass.