The only things that you will need are a servo, 1 of the factory mounting brackets, servo spacers and M3 screws to attach the servo to the block and factory bracket. (found in your original kit hardware) All other screws are included. (4-M3x8mm flathead and 1-M3x6mm SS button head)
I designed this to use the 8mm long screws to improve strength and durability. Sure it's a little heavier but it won't move.