I need to replace the backspace key on my keyboard for my Acer Aspire S7-392. I've ordered a backspace key from http://www.laptopkey.com/KeyboardKeys.php/Acer/Aspire/S7-392 and from http://www.replacementlaptopkeys.com/acer-aspire-s7-ultrabook-keyboard-keys-replacement-backlit/
Both key's I've recieved have been the incorrect key.
These are the keys I've gotton from both places:
And this is what the socket and key that's actaully inside my keyboard looks like:

As you can see they're quite different so the one's I've ordered haven't fit . I'm 100% sure I have the 392 model it says it right on the sticker on the back of my laptop. So my question is where can I find the key that's in the second picture? Is it possible that's the key for the 391 model? Or maybe it's a key for adifferen't model entirely I don't know but it frustrats me when I order a key for the model of laptop I have and it's no where near the key that's in my laptop.
Where can I find this key? Thanks