Dell OptiPlex GX1 Service Manual page 148

7-4
Disengage the locator pins that position and help secure the stand to the
computer.
When reinstalling the optional stand, align the front edge of the stand with the
groove between the front bezel and the computer cover. Move the stand until
the locator pins engage the holes in the side of the computer. The locator pins
are keyed for correct installation.
securing
buttons (2)
front of computer