Recently got a case that needed head replacement. Have tried 6 donor heads(use hddsurgery tools), all still work when I put them back in the donors. I examined the customers head under microscope. It has a different slider and the other side is slightly different also. So I went through every head I have in stock(so time consuming opening these drives). None of them have the same style slider as this customers drive. This was roughly 20 drives ranging from 2016-2020 and mix of TK and WU drives. I do have pictures of side by side comparison. New to the forum not sure how people feel about sharing openly. My main question, is there a way to tell from the label or the ROM which slider is in the drive? I have not been able to find a difference specific to this problem. Obviously label is best, so I can find a donor for this case.

Thanks