We do not guarantee anything, do it (or not) at your own risk.
Do not blame us if this doesn't work or if something breaks.
Due to a number of questions in the groups, I figured, I'd try and help out:
Left drive is the NEC, right is the drive from dell (Teac DV-28E). It comes out if you pull over the lock and pull out the drive. (Failing to do this properly should tell you that you should not attempt this any further).
At a first glance, everything looks fantactic! Drives look similar enough.

Now... DO NOT PANIC! As you can see, the connector is ON THE OTHER SIDE.

This view is easier to use for show:

The black frame you see is something we are going to move from the dell drive to the new one. It comes out along with a thin panel which moves the connector over to the "wrong" side.

You will need: couple thin flat screw drivers (or a knife or two). A tiny philips screwdriver (to fit the tiny screws).
Heads up: you will probably endup scratching the dell drive a little (details in a second). Read through all steps before starting out. It's important you do not try to separate the plastic from the drive prior to the right step.
1) Unscrew screws labeled 1 - 6. (Hint: 5 and 6 will be a little longer than others.)
2) "#7" Points you to where Dell decided they will use some glue. I recommend using a thin and small flat screw driver to cut it. Go from one side (or from both sides) in. If you feel adventurous, you could use a knife. Be careful not to mangle the metal plate. If you scratch it - that's ok. Just don't cut yourself and don't cut through the plastic. Don't put too much pressire on the plastic or the metal plating underneath. Slow does it.
3) Now that the glue is no longer holding the plastic in place, lift it a bit a slide the plastic frame off the drive (to the back)
4) With plastic off, we can now take off the board with the connector. Insert/wedge the thin screwdriver (just a little, not the whole thing) between the connector board and the laptop drive. Somewhere around the middle of the drive. Then slowly wedge your way towards the connector that goes inside the drive. Entire board (see picture) should come right off. Slow does it. Don't pull or yank.
5) Reverse steps to put the two on the new drive. Make sure screws are tight.
6) Slide it back into dell. Forgive NEC the new gap (the front plate is a bit smaller, so it's not as tight fit as the original drive). Just call it "cooling hole". Enjoy the new burner.
7) Reward help - Click a sponsor link. ;)