Any place that sells hydraulic parts will have breathers.
It's just a fancy pipe plug with a tiny hole drilled in it to allow air in and out.
You need to know the type and size of thread used on your hydraulic cylinder to get the right one. Some are NPT (standard iron pipe thread), some are O-ring.
Question: What kind of implements are you going to use with this? Some implements don't do well with "gravity down" (slow to lower) and some don't work at all (steering on a dual-rake hitch, for example).
Adding the two-way valve will make your tractor a lot handier, and you won't have to replumb the hydraulics every time you switch tractors. You can damage newer tractors by hooking one-way implements to a two-way valve, and "squealing the relief valve" when you lower the implement.
When you attempt to run a one-way cylinder with a two-way system, it works fine to raise, but when you lower, the tractor is trying to force oil down a hose that doesn't exist. This trips an internal relief valve which will protect the system for a short period, but if you hold it a long time, the oil will get very hot and the pump can get damaged.
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