Yes it's possible to mount the savox 1251 low profile servo without needing extra bits.
This type of servo's just gives you more free space behind the servo for the other elektronics.
And you can use the RM01 servo mounts to move the servo an extra 3mm towards the front, this can onbly be used when using a turnbuckle instead of the plastik part that is mounted between the servo saver and the steeringbridge.

Hope this helps