This genuine Zetor 78185017 spring is an authentic OEM replacement part designed for a wide range of Zetor tractors. It is compatible with models including the 5211, 5245, 6211, 6245, 7211, 7245, 7711, 7745, 3320, 3321, 3340, 3341, 4320, 4321, 4340, 4341, 5320, 5321, 5340, 5341, 6320, 6321, 6340, 6341, 7320, 7321, 7340, and 7341 series. Manufactured to Zetor's original specifications, this spring ensures precise fitment, optimal functionality, and durability for critical machine operations.