Purchased the loader hydraulic cylinders for the bucket of my John Deere 40 Loader. They perform just as well and a fraction of the cost of a new John Deere cylinder. They are actually only slightly more than rebuilding the cylinders. Although the bore is slightly smaller, cannot tell a difference in performance of the bucket. The new Chief cylinders have been used more than the rebuilt ones I had on the tractor (that started leaking) and have no issues so far. Even if they did, they have a 2 year warranty. I already picked out the Chief cylinders to replace my boom cylinders when they start leaking. The boom ones have the same bore as the old.