I have asus g751j that started acting wierd after some watter damage. First some letters wouldnt work like number 2 or escape and after couple of days when i press letter k it would make three letters in a row... and so on... So i figured its better to open it and to see what is hapenning. The problem is that keyboard is attached with plastic small solders to upper part/cover of the laptop. So first i tried to reinstall the flex cable, but that didnt get me anywhere. So i decided to remove the keyboard. In process i had to remove also that small plastic holders that were holding keyboard to that upper case.

As you can see in this picture there are black plastic holders that are holding metal plate, and that metal plate is holding the keyboard

What i am asking if i remove it and buy a new keyboard how can i reinstall those plastic holders? As i closely look they are like soldered to hold the metal plate and keyboard. I have to destroy/remove them to get to the keyboard..but how to solder it back?
The reason why i am asking is i can see on ebay or amazon people are selling only keyboard fo like 25$ or the whole upper case with keyboard for about 80$. So if i figure how to reinstall only a keyboard i would save arround 60$, but the problem is that plastic holders...
Anybody have any advice on how to reinstall them? or any other advice? thank you