Dell OptiPlex GX60 - Manual (Page 36)

3. Replace the computer cover and ensure that the two metal hooks and tabs are securely in position.
4. To replace the front mask and accent door, press them into position.
Small Desktop Computer
Follow the steps in the " Removing the Control Panel " procedure in the reverse order, ensuring that all tabs are secure.
Small Mini-Tower Computer
1 accent door
2 front mask
1 metal hooks (2)