The rear limbs are the only parts that have a "side". 3 for the right, and 3 for the left. They allow decent adhesion to the base so you dont have to have one of the front limbs touching the base like the original design. Once attached, the rear limbs will always fit on the base when the Kifua is centred correctly. We also recommend attaching the Scything Talons before the front limbs.The Teardrop base is orientated so the wider end is facing to the front of the model with the extended thinner end being the rear.