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2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
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Adamanta 128GB (4x32GB) Memory Upgrade for 2019 & 2020 Apple iMac 27" (iMac 19,1 iMac 20,1 iMac 20,2) w/Retina 5K Display DDR4 2666MHz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM at Amazon.com
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Apple's 4K 21.5-Inch iMac Allows You to Upgrade RAM and CPU – Company Finally Dialing Down on Soldered Components, Reveals Teardown
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