There is a certain quantity and a decent quality too. You will need all new O rings and piston band gasket material.
they are remote reservoir gas pressurised units. They are easy to take apart but very difficult to reassemble correctly. If you don’t have to kit you will fail. Your suspension will not work correctly and will be dangerous.
You have to know how to remove the air bubbles and purge the damper. If the pressure is incorrect or you have too much or too little oil, it will not work.
leave it to the professional people. They will balance them and match them correctly. This is not a home mechanic thing. I 100% guarantee you will make a complete balls of it.