Hi,
I think that you may be out of luck in trying to replace the WiFi card.
Looking at images of the motherboard for the laptop taken from this link there is no removable WIFi card as it appears that the WiFi IC is hard mounted on the motherboard.
The images show the antenna and if you follow the black antenna cable from the antenna back to the motherboard you can see where it connects on the motherboard and that there is no likely looking removable card there or anywhere else.
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