What you need is the correct category for your hitch (cat 1 or 2) and retracted and extended lengths in the right range. You can select a valve with pilot operated check valves or one without. If you want it to be able to float, get without. If your valves leak, then the check valve will keep the link from moving while the tractor is sitting.
You can wind your turnbuckle top link in and out to get the lengths to start with though you could go with something different. If it's too long you won't be able to retract it enough and the implements will drop farther than needed.
You'll also need hydraulic fittings to adapt the ports on the cylinder to your hoses and fittings to adapt the hoses to quick connects. You can use small diameter hoses for this, 5/16 or 1/4, as the flow is low.