Success! Replaced a dead fusion drive in our iMac 27” 5K Retina (Late 2015) with a brand new 2TB SSD. One comment after going through this ourselves: you really don’t need to take out the whole speaker. You can just loosen the two screws and move it aside to access the drive/put the new one in. Saves a bit of effort on that step. Otherwise, this was flawless. Thank you so so much for the guide and the link to necessary tools and making it as painless as possible. Couple of notes to anyone reading through these comments for tips: 1) You do NOT need to take out the whole speaker. You can just loosen the two screws and move it aside to access the drive/put the new one in. Saves a ton of effort. Don’t do it! 2) Watch this video: https://vimeo.com/139364064 - it makes it all seem so much less intimidating and I think the video in conjunction with this guide will get you to the right place. Good luck. :)

Don’t know if you are still around, but THANK YOU for posting this video! The video made it seem SO NOT SCARY and, in conjunction with the photos and comments and tips on this guide, was a lifesaver. Big thumbs up.