How do I secure new keyboard to frame

I just replaced my keyboard on my macbook pro 15" Retina A1398. After a little difficulty was able to pry the old one off the frame, therefore popping the rivets off that were holding the keyboard in place. Only bad part is that after the rivets were removed there was no way to put them back. Does anyone have any suggestions on how to secure the keyboard to the frame so it doesnt move around? Thanks