GringoPost | Ecuador: I need help to install graphic card on my iMac

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I need help to install graphic card on my iMac

I need to upgrade my iMac 24 inch (vga) video card to my computer
And here is my computer info:
OS X EL Capitan
Version 10.11.6
Imac (24-inch,Early 2009)
Proccecor 2.66 GH Intel Core Duo
Memory 4GB 1067 MHZ DDR3
Graphics: NIVIDIA Ge Force 9400 - 256MB (Low Card)

I'm looking to buy new graphic card with at least 1GB to 2Gb to install it to my computer
If anyone know where to get new parts for iMac

Please let me know,

Thanks

Adison luke: Adison_lok@hotmail.com .

City: Cuenca