Hold that thought!
Fusion Drives are similar to a mirrored drive set. All of the data is on the HDD. The SSD holds the cached version of the files from the HDD (copies). It’s only if the file is altered and was not able to copy back to the HDD that the SSD might have something different (very rare).
So… If the HDD is recoverable you’ll likely have everything maybe one file if the system crashed out just before the write action (a rare possibility). So you only need to ship the HDD for recovery.
As you didn’t tell us what happened you might not need to go that far! Can you tell us what happened and what have you done so far.
I've never had to deal with this exact situation so I'm not sure. So, lets look at this logically, the system does have a NV RAM chip which holds settings so I would assume if I reset it the setting would be lost. So I would do that before installing the drive. To do that you'll plug in a bootable external drive and then do a reset with a USB wired keyboard. Here's how: Reset NVRAM or PRAM on your Mac.
As you’re installed a new drive any settings the Fusion Drive had are gone now. The rest of the task is just install the drive!
Besides the SSD you’ll need a 2.5 to 3.5” adapter frame like: 2.5in SATA Hard Drive to 3.5in Drive Bay Mounting Kit we really only need the metal bracket and the screws. In addition to the frame you also need a in-line thermal sensor: OWC In-line Digital Thermal Sensor for Hard Drive Upgrade for 27" iMacs 2012 and Later It also has the needed display adhesive tapes. But! You will need some tools to take the display off without damaging it! Here’s what you need:
You still need a bootable USB thumb drive to boot the system and install the OS here’s how to do this: How to create a bootable macOS Sierra installer drive. You’ll note I’ve pointed to the Sierra setup I would recommend you still with this release until Apple fixes APFS when running on SATA drives, which hopefully is in this falls release.
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That was someone with a working system. As you claim yours is broken we need to be careful here if you want to save your data. And if you want to reconfigure your system then we can address that.
When I wrote that answer things have changed a bit. We now have a good source for the custom Apple blade SSD's and a good reference on what each system uses. Here's the reference: The Ultimate Guide to Apple’s Proprietary SSDs. Don't go crazy here I'm just putting it out to you to get a better idea what your system has.
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