Confirm My Book Version

I have a legacy My Book Premium Drive that was exchanged under RMA #[Deleted - Trancer] with paperwork dated 17-APR-2008. On the paperwork the drive reads MY BOOK Premium Galaxy 1C 500G. On the drive for ID is the following:
MDL: WD5000P032
S/N [Deleted - Trancer]

I did register the drive but with all the different IDs and numbers for the drive I now have, I do not know the correct name for the drive as I would find it under the list of legacy drives on your web site. I need this to be able to find any updates, guides or manuals for the drive.

Please advise me on which drive description in your legacy drives I should be referring to for further information on my “MY BOOK”?

Your unit is a WD My Book Premium Edition, 500GB (WDG1C5000N)

http://support.wdc.com/product.aspx?ID=102&lang=en

Thank you for the correct My Book designation for my HD. I cannot find a manual for this. I am able to find the support page but I cannot click on the url position shown for manual. Where can I get one or substitute.