Notes: 3497570 DOUBLE U-JOINT B320 55 DF L722 GR 191.5 is original CLAAS product. 3497570 DOUBLE U-JOINT B320 55 DF L722 GR 191.51 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849