Notes: 28526 O-RING 2031 2-011 7.66x1.78 is original PANHARD product. 28526 O-RING 2031 2-011 7.66x1.785 is commonly used in transmissions/axles/engines 128410, 129691, 135100, 135590, 136065, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849