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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

OEM hard drive replacement

What is the Kit for an OEM hard drive replacement

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Is this what you are looking for? SATA HDD to SSD upgrade or PCIe/NVMe Blade SSD upgrade

And here's the two guides:

The HDD drive swap-out is the easiest to do, but the Blade SSD offers better performance.

Do keep in mind if you have a Fusion Drive you have both drives present! And you will need to disable the Fusion Caching SSD (Blade Drive) otherwise you'll encounter issues as it wants to join the fun which you don't want!

The easiest way to disable it is once you have the system running open Disk Utility and make sure you select show all volumes so the hidden Cache drive can be selected and reformat it deleting it fully. Is mostly a useless drive as it's too small to effectively hold the OS.

crwdns2886500:0Upgrade the storage and improve boot time and read/write speed in your iMac Intel 27" Late 2012-2019 with this SSD upgrade kit.crwdne2886500:0

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iMac Intel 27" (Late 2012-2019) SSD Upgrade Kit

$112.99

crwdns2886500:0Upgrade your iMac with a new SSD to dramatically speed up your machine.crwdne2886500:0

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iMac Intel 27" (Mid 2017-2019) SSD Blade Upgrade Bundle

$139.99

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Core Solutions crwdns2934231:0crwdne2934231:0
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