Desperately Need an Installation Disk

I misplaced my installation disk for my WD External Drive for Mac.
I called WD and my external drive is out of production.
Does anyone have an installation disk that they could spare?
I had to reboot my laptop and lost the program to run the drive.
Its an older drive.
S/N:: - WMAL91027266
MDL - WD1210B011 RNN