These are the rivets you need towards the bottom of the page on this link.
https://www.pinrestore.com/Riveting.htmlIdeally you’d have a rivet press too but there are other ways to fix them. There’s lots of different length rivets but you only really want the rivet to be just a little longer than the objects they pass through plus the washer on the other side.
Go gently riveting plastics too because it’s easy to go to hard and pull the rivet through the plastic.
