The standard size for our Hydraulic Top Links is 20" closed. Other sizes cost an additional $5.00, remember to choose the size you need at check out. The best way to determine the length Hydraulic Top Link you need is to measure your existing Top Link from center to center of the ball ends and subtract 4". Subtracting 4" will allow you to have adequate travel in either direction of the normally used position. Once you use a hydraulic top link you will never go back! Hydraulic Top Links are great for tilting all of your 3 point implements and works great with the easy change system for fast hook ups. You will need to supply your own hydraulic lines for attachment to your tractor's remote hydraulics.