Compaq Deskpro 2000 Series Reference Manual page 129

If you are installing a 3.5-inch hard drive into a 5.25-inch bay,
you will need a bracket to hold the 3.5-inch hard drive in place.
A bracket (part no. 247239) for this purpose can be purchased
from Compaq Computer Corporation.
3. Place the hard drive into the bracket.
4. Insert four screws into the bracket holes on both sides of
the bracket in order to secure the hard drive.
Placing the Hard Drive and Inserting Screws into the Bracket
5. Remove a Compaq precision screw from the front of the
computer frame and insert the screw into the side of the
bracket. This is a guide screw used to position the bracket
in place inside the drive bay.
Inserting the Guide Screw into the Bracket
6. Install the hard drive assembly into the drive bay using the
flanged screw to position the assembly in place.
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Reference Guide 6