A-Tech for Apple 6GB Kit (1x2GB + 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com
2008 iMac: Repairs, RAM & SSD Upgrades - YouTube
Apple iMac 20" A1224 (Early-2008) Core 2 Duo 4GB 250GB SSD – UKSL MacLab
Install An SSD Into An Early 2008 iMac - Larry Talks Tech
iMac 2008 | SSD upgrade in 2021. Is it EASY? - YouTube
How to Upgrade iMac Hard Drive (2007, 2008, 2009): EveryMac.com