What size screw does my metal gear servo take?

Futaba S9202 M2.6x8
Futaba S9303 M2.6x8
Futaba S9304 M2.6x8
Hitec HS-615MG M2.6x8
Hitec HS-645MG M2.6x8
JR DS8411 M3x6
JR DS9411 M3x6
Multiplex mc/V2 Jumbo M3x6
Multiplex mc/V2 Jumbo Spd M3x6
Multiplex mc/V2 Power M3x8
Multiplex mc/V2 Profi M3x8
Multiplex mc/V2 Profi Spd M3x8