speaker screws

i have a 92 sc2 and i just added speakers to my car the previously didnt have any. can any one tell m ethe screw size that i nned all the way around so that i can tighten my speakers down better? thanx

front or rear?

both. what the the screw size for the front and back speakers so that i can properly tighten them down?

the fronts use a retainer simular to the push rivets all around the car, except the center "push in" part is replaced with a plastic screw. i do not know about the rears.