They will need to be replaced with Olympic Rivets if an outside panel, aluminum pop rivets on the inside. No sheet metal screws.
Biggest thing is try to ascertain what caused them to break. There may be something going on underneath somewhere.
Region 3 , 1st VP
Go often to the house of a friend, for weeds choke the unused path........Emerson
Never pick a fight with an old man. If he is too old to fight he will just kill you........a wise old man.