We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
If you actually had the equipment and know-how to assemble a hard drive from spare parts, you wouldn't be asking this question.
If you are just diving into this thinking you can figure it out yourself, STOP. You can't. All you will do is further damage the data. Send it to a professional service.
While I appreciate your response it sounds a bit snide, which I’m sure you don’t intend to sound like. I did send the drive to a highly recommended data recovery service. They were able to recover some of the data before it crashed. They told me one way to try to recover the rest of the data was to find a donor drive where the p/n, sn, fw, site and dom matches as closely as possible. They said to feel free to search for a drive if I wanted, I found a drive that matches with a dom that was reasonably close but when they opened the drive the read / write heads part number and version was different. I was curious if anyone new if any of the part numbers on the outside of the drive would indicate what read / write heads were in the drive. I have found more drives with closer a dom but didn’t want to just start throwing money at it hoping it would have the correct heads. I did contact seagate and from the information I gave them the other drives I found seem to match what I’m looking for. But again, I was just hoping there was a more definitive indication of the heads installed in a particular drive.