How to install glovebox??

They aren't all the same or easily interchanged. The casdboard glove box has nuts attached to the outside. The screws go through clear holes in the dash sheet metal.
The plastic glove box has larger clear holes. The screws attach to small holes in the dash sheet metal. The plastic glove box also has a lip for finish around the outer edge.
Bottom line , It's best to replace with whichever was original.