Hi!
There are too many kinds around: you have just to take a bunch of them from a scrap yard (or similar

), from various old PCs, and try.
If it's a matter of millimeters down, use some washers to rise the drive up (if there are no height problems), and maybe use some longer screws.
Take care also about the eject button: even in this case you have to fit with a d-i-y job much probably.
By!
