Wdbaau0020hbk-01

Please read this earlier post.

You can search Amazon or eBay using your model number and find a power supply. OR you can buy an empty usb enclosure (one that comes with a PS), remove the drive from the old one and insert into the new one.

If you damaged the WD enclosure (not the drive itself), the swap should work. If you damaged the drive, you may still be able to use some recovery software.

One step at a time.