Acer A315-59-53ER laptop missing key, how do I go about replacing the kissing key?

My son has informed me, his "2" button has broken off his laptop and it is missing the clips [or the clips had broken off from use] .

I was wondering how do I go about replacing the kissing key? Is there a website to order this part? Will I just need the key or do I need to replace the whole keyboard? What all will I need to fix this if I can find the missing part(s)?

I apologize for all the questions. I'm new to this board and wanted to get as informed as I can so I can start my search. The more knowledge, the easy [I hope] to get this resolved.