On the D-Series (D5xx, D600, D7xx, D8xx), they have interchangeable bays, called D-bays or media bays - this allows you to use them with different components which can alos be used between laptops if needed. I got my HDD bay and battery pack on eBay, fairly reasonably compared to Dell themselves. the HDD bracket/bay looks like this:
These bays will usually fit the following models, so you can expand your search:
- DELL Latitude D400, D500 ,D510, D5X, D600, D610, D620, D6X, D710, D800, D810, X300, X1, XPS(Latitude XPS)
- DELL Inspiron 300m, 500m, 505m, 510m, 600m, 700m, 8500, 8600, 9100
- DELL Precision M20, M60, M65, M70
The other types available are:
DVD/CD
Battery
Filler
FDD
...an maybe some others
Usually removed from the side of the PC using the push-catch