Which Keyboard can I use as replacement?

Hello!

I have my mothers MacBook Unibody Model A1342 Mid 2010 Serial: W80222UJF5X and I am looking for a keyboard replacement, because of a liquid spill. I know that it is a bit tricky, but I have some experience and would like to try to repair it myself.

Unfortunately I cannot find the right keyboard replacement. I am a bit confused by modelnumber and missing part number. It is a US-Keyboard. Do you know where I can get the right one, or how do I know if it is the right one?

Another question is: Do I have to replace the backlight of the keyboard as well?

Thanks a lot for your help!

Sebastian