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MC978LL/A is the sales number for the iMac 21.5" 3.1GHz Core i3. This model was first released on August 8th, 2011.
Apple Parts for iMac 21.5" 3.1GHz Core i3 (MC978LL/A)
661-5938 - SDRAM, 2GB, DDR3-1333, SO-DIMM
661-5939 - SDRAM, 4GB, DDR3-1333, SO-DIMM
661-5940 - Hard Drive, 500 GB, SATA, 3.5", 7200
922-9133 - Mechanism
922-9796 - Stand
922-9807 - Pressure Wall, Optical Drive
922-9816 - Bracket, Video Card
922-9864 - Mechanism Cover
923-0189 - Cover, Power Supply, iMac / Display, Pkg. of 3
* - Denotes that we sell an alternate part instead of the actual Apple product.