Lattitude E4300 Disk Caddy?

I just got an E4300 and I am looking for a disk caddy for my second drive.  I don't want the one that slips into the second bay, just the one that screws into the drive itself and slips into the HD slot (replacing my first drive).  For my last laptop, I bought the caddy on ebay, but no one seems to be selling the E4300 caddy.  Does anyone know what the part number is for the caddy or where I can get one cheap?  I think the one I bought for my last laptop was ~ $7.

Thanks!