Have you tried contacting Dell Spare Parts? 1-800-357-3355. Have Service Tag available.
I have an optical drive (Dell P/N 35KW8) but it's a bare drive. I need a front bezel for ODD for the Optiplex 7000 Tower to install the drive but can't for the life of me, find the part number for that bezel. Can anyone help?    
Optical drive for Optiplex 7000 Tower