16.0GB OWC Memory Upgrade Kit for 2017 iMac 27-Inch
Adamanta 16GB (2x8GB) Memory Upgrade Compatible for 2017 Apple iMac 27"/21.5" Retina 5K/4K or Non-Retina Display DDR4 2400MHz PC4-19200 SODIMM 1Rx8 CL17 1.2v Single Rank RAM DRAM at Amazon.com
Apple Genuine 661-07301 Memory SDRAM 4GB DDR4-2400 for iMac 21.5 inch Mid 2017 Retina 4K 27 5K
2017 IMac 5K 27 inch apple memory Ram 4GB 8GB 16GB 32GB DDR4 2400 - AliExpress
Apple iMac 21.5" 2017 i5-7360U 2.3GHz 8GB DDR4 1TB HDD OS Monterey - Grade B+ | eBay
16GB Memory Upgrade for 2017 21.5-inch iMac
Timetec 64GB KIT (4x16GB) Compatible for Apple 2017 iMac (27-inch w/Retina 5K Display) DDR4 2400MHz PC4-19200 1Rx8 CL17 1.2V Non-ECC Non-Parity Unbuffered SODIMM Memory MAC RAM Upgrade for iMac 18,3 at Amazon.com
64GB Memory Upgrade Kit for 21.5-inch Apple iMac 2017
Apple iMac 21.5" 2017 i5-7360U 2.3GHz 8GB DDR4 1TB HDD OS Monterey - Grade B+ | eBay