Tired of those leaky, problematic OEM JD quick couplers?! We were to! Here’s the answer. Transform your John Deere tractor with this hydraulic coupler conversion kit. This kit is designed for 50-70 series models including 4050, 4055, 4250, 4255, 4450, 4455, 4560, 4650, 4655, 4750, 4755, 4760, 4850, 4955, 4960, 8650, 8850, 8760, 8770, 8870, and 8970.