i would like to replace my 1GB sticks with 4GB sticks on my iMac 20-inch, early 2009. I believe I need two DDR3 4GB sticks. Is this it?

upgrade memory

Apple Memory Module 4GB 1866MHz DDR3 ECC SDRAM DIMM - 1x4GB

Apple Memory Module 4GB 1866MHz DDR3 ECC SDRAM DIMM - 1x4GB

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