Hey Forum! Long time no post. My DVD drive went on me the other day when a family member decided to flip the cushion it was sitting on. Now it makes a weird low noise instead of the fast mechanical one it used to make at start up. Soooo, it's time to replace it. I'm not going to a techy as the last time I did it, I ended up spending $300 for them to wipe my harddrive clean when I specifically asked for a new screen (Plus it took a week and a half and I don't have that kind of time). So I've been looking to buy one and install it myself and so far it doesn't seem hard except I can't get a correct answer to a few questions. 1. My DVD drive is a "MATSHITA DVD-R UJ-868" but I keep seeing it with an "A" at the end. Is there any differences between "UJ-868" and "UJ-868A"? 2. I've recently found a "Macbook Pro Superdrive GS21N" and a friend of mine jumped the gun and bought it for me. Now the seller says its the wrong part and that I'm going to have to go through the awesomely stupid return process they have but the website www.powerbookmedic.com says that its compatible but: "one of the screw holes may not line up to the brackets inside." So basically, I'm a bit lost. Can I use the "GS21N" drive or does it have to be a "UJ-868"? I've been thinking of ignoring the package and having it returned to sender to speed up the process of getting it back to them but if it could work then I'll use it. Thanks in advance!