I see at least six of those for sale on eBay, unless you're in a country they all just won't ship too.
Besides matching the relevant part of the DCM code, country, and date, it really only matters that you match the correct family. If you check out this page of this forum you can determine drive families by the code after the dash (e.g. -11AJGS0):
identify-wd-marvel-families-by-code-after-the-dash-t636.html
As you can see there, your drive is FBLite family, so any drive with the following after the dash code can potentially work for heads: ..AJGS. ..JC3T. ..CYNY. ..N6G.. ..UE4T.