16GB (2x8GB) DDR4 2666MHz ECC PC RAM | Integral Memory
Apple Memory Module 16GB DDR4 2666MHz SO-DIMMS (2x8GB) - Apple
OWC 16GB (2 x 8GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16P) at Amazon.com
Corsair 16GB (2 x 8GB) Mac Memory, DDR4 2666MHz, SO-DIMM, CL18, musta - Jimms.fi