Notes: 93-1751 HEX HEAD SCREW UNI 5739 M12X35 10.9 is original ZETOR product. 93-1751 HEX HEAD SCREW UNI 5739 M12X35 10.91 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849