Notes: 11530650 DOUBLE U-JOINT B310 55 DVP (GR. 189 Z12 is original CLAAS product. 11530650 DOUBLE U-JOINT B310 55 DVP (GR. 189 Z121 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849