WD caviar green need donor disk to buy?

I need to buy WD20EADS-65R6B1,last four digits must be same(R6B1),i need to replace electronics on my broken disc,where can I buy this disc…please help

Finding a drive with the same last number will be a really hard thing to do. You might be able find the drive in Ebay.

I have a new one I can sell you.  wd20eads-65r6b1