Notes: 51335924 HEX SOCKET HEAD CAP SCREW UNI 5931 M12X3 is original NEW-HOLLAND product. 51335924 HEX SOCKET HEAD CAP SCREW UNI 5931 M12X31 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849