I need to replace the gaskets on the power steering pump on my Toyota Landcruser HZJ75. Is there anything specific I should take care of while doing it (torque), or is straight logic enough? I am in Ethiopia and the Toyota dealer does not have the gasket kit at the moment, does the gasket kit contain only O-rings? Do they need to be original Toyota once, or can I replace with any as long as the size is right? Does anyone know which sizes I need?