IBM System x3100 M4 Type 2582 Problem Determination And Service Manual page 240

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IBM System x3100 M4 Type 2582: Problem Determination and Service Guide
2. Align the bottom edge of the simple-swap backplate between the tabs and the
bottom edge of the drive cage, and then rotate the simple-swap backplate
toward the drive cage.
3. Make sure the tabs on the simple-swap backplate are on the left of the upper
drive cage tabs, and then push the backplate till the end.
4. Slide the disk drive cage into the opening in the front of the server till half in.