Dell Dimension 2200 Owner's Manual page 71

Remove the extra rails from the front of the computer frame (see the
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illustration below).
Install the rail marked "L" on the left side of the drive and the rail
marked "R" on the right side of the drive.
front of computer
left rail
right rail
Slide the drive assembly into the drive bay.
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NOTICE: Dell does not recommend routing cables over cards because the
cables can restrict airflow, cause cooling problems, and interfere with
removing and replacing the computer cover. If you must route cables over
cards, be extremely cautious when removing and replacing the computer cover.
If you are installing a controller card, configure and install it in a
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connector slot now (see page 73 for instructions).
Install the card as close as you can to the drive cage.
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Adding Parts