Genuine Apple 4TB (2x2TB) PCIe SSD for: 2017 iMac Pro A1862; 2019 Mac Pro A1991 | eBay
2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
2017-2020 Apple iMac 5K 27 Inch 3.8GHz Core i5 2TB SSD Fusion 16GB RAM 8GB GFX | eBay
Flash Storage - 2017 iMac 5K vs others
iMac (Retina 5K, 27-inch, 2017) CPU and NVME SSD Upgrade Pitfalls and Tips | Page 5 | MacRumors Forums
Refurbished: Apple A Grade Desktop Computer iMac 21.5-inch (Retina 4K) 3.0GHZ Quad Core i5 (Mid 2017) MNDY2LL/A 24 GB 2 TB SSD 4096 x 2304 Display Mac OS Includes Keyboard and Mouse - Newegg.com