Dell XPS 730 (Late 2008) - Manual (Page 66)

64 Replacing Drives
6 If no screws are attached to the new Media Card Reader, check the inside
of the drive panel for shoulder screws. If screws are present, attach the
screws to the new card reader.
7 Slide the Media Card Reader into the drive bay until it clicks into place.
1 media card reader 2 shoulder screws (4)
1
2