Enlight drive rails seems to be readily available on eBay at the moment.
Here's some.
The drive caddy was a standard part, or darn close to it. I got a replacement or two sold by manufacturer Star Tech as a 3.5 to 5.25 drive adapter. Their current production run is a single piece of plastic, however, instead of metal with a plastic bezel. It'll probably work as a functional replacement, if not a cosmetic one. If you just need to mount a hard drive internally, any old set of 3.5 to 5.25 brackets plus the drive rails will work.
This appears to be the metal caddy, although modern fashion seems to indicate that the bezel only comes in black.
EDIT: Aha,
here's some white ones.
