Futaba S3114 S3154 Servo Saver. Distance center hole - servo axle: 9.00 mm.
This is the second uploaded version of this servo saver. Previous one was same but was supplied in 3 different parts that make difficult the manufacturing process. Now the 3 pieces are linked with thin wires to make easier the process. Just cut the 3 pieces and assemble it.
UPDATE 3: Thicker sprues to better perform manufacturing process.