Dell OptiPlex 360 (Late 2008) - Manual (Page 75)

Drives 75
2 While gently pulling the edges of the bracket away from the hard drive, lift
the hard drive out of the bracket.
3 Place the hard drive bracket on a flat surface, with the label face-up.
4 With the top edge of the hard drive oriented toward the bracket tabs, seat
the left edge into the bracket, inserting the pins on the bracket into the
pinholes on the hard drive.
5 Pull the right edge of the bracket out and seat the right edge of the hard
drive, inserting the pins on the bracket into the pinholes on the hard drive.