A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com
How to Upgrade the RAM in Your iMac
Apple iMac (27-inch, Late 2009) Serial Number Lookup - AppleSN.info
iMac Intel 21,5" Late 2009 EMC 2308 - used original spareparts for Macs
iMac | 3.06 GHz Core 2 Duo | 27 Inch | Late 2009 - Techable.com