M4800 hard drive caddy wanted

Hi - I'm trying to find another hard drive caddy for my M4800, so that I can easily swop hard drives, without having to prize the hard drive out of my only hard drive caddy.
Just so I can use my old, cloned, computer (now on another hard drive), and this new computer, trying to make swopping the drives easier.
Does anyone know the part number I need - or where I can buy one of these?

 

If you don't use the optical drive, why not get the optical drive caddy instead and boot either drive you want to boot from via F12 start up menu?

Much easier to find than the hard drive caddy, if you still need it, you can try contacting Dell and ask if they can send you one, doesn't hurt to try.