Apple 32GB (2 x 16GB) 2400MHz DDR4 SO-DIMM PC4-19200 Memory Upgrade for Late 2015-2017 iMac 27 inch with Retina 5K Display at Amazon.com
32GB Memory Upgrade Kit for 21.5-inch Apple iMac 2017
Apple Memory Module 32GB DDR4 2400MHz SO-DIMM (2x16GB) - Apple
Apple Memory Module 16GB DDR4 2400MHz SO-DIMM (2x8GB) - Apple
DATARAM 32GB Memory RAM Upgrade (2 x 16GB) DDR4 2400Mhz PC4-19200 CL17 SO DIMM Compatible with The Apple iMac Core i5 2.3 21.5-Inch (Mid-2017) 18,1 at Amazon.com