Dell OptiPlex GX1p - Manual (Page 81)

Front-Panel Insert Removal (Mini Tower Chassis): Dell™ OptiPlex™ GX1p
To remove a 5.25-inch front-panel insert, follow these steps:
1. Hold the bezel with the front facing you.
2. From the front of the bezel, use your thumbs to press inward on the insert until it slides off the 2 posts.
To replace a 5.25-inch front-panel insert, position the 2 ring-tabs over the posts on the inside of the bay opening, and then press the ring-tabs over the posts.
To remove a 3.5-inch front-panel insert, follow these steps:
1. Hold the bezel with the front facing you.
2. Inside the bezel, press the eject button mechanism toward the front panel to snap the plastic insert out of its opening.
To replace the 3.5-inch front-panel insert, work from outside the bezel. Place the insert in position, and press it into the opening.