I have the center frame with the motor, jack screw and the early design linkage. It is completely interchangeable and the only difference is instead of a Y shaped yoke it has 4 independent arms. I bought it as a spare as it was said to be slightly stronger and appeared to have been redesigned by DJI for cost savings and ease of production. I paid $350.00 plus shipping and will sell for the same. I am located in Northern New Jersey USA