Dell Vostro 400 Owner's Manual page 120

1 alignment guide
4 card retention bracket
7 guide notch (2)
12 Fix the card retention bracket by replacing and tightening the screw.
13 Connect any cables that should be attached to the card.
See the documentation for the card for information about the card's cable
connections.
120
Removing and Installing Parts
1
2
2 filler bracket
5 screw
3
4
5
3
6
6
7
alignment bar
guide clamp (2)