iMac Intel 20" Mid 2007 EMC 2133 - used original spareparts for Macs
iMac Memory Upgrade (2007 Model) - YouTube
A-Tech for Apple 1GB DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook, MacBook Pro, iMac, Mac Mini - (Early/Mid/Late 2006, Mid/Late 2007, Early 2008, Early 2009) - Memory RAM Module at Amazon.com
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
iMac (2007-2009) Memory Installation Video - YouTube