Dampers

I have another question for this same Lincoln Continental 95, as you may know this car have a suspension system controlled by compressor, you know what kind of dampers I will need to replace the original suspension system in order to use oil or gas dampers? Most of the local mechanics told me that they need to review with different kind of dampers due is necessary verify the stretch/compression to put the correct damper model, could you please help me with this detail?? I want to replace this system controlled by compressor because since I buy my car this system is out of service due a missed or damaged parts and I think that will be very cheap replace the dampers instead to fix the original suspension.