Tell us about yourself!
The parts are recycled pneumatics and they are not easily sourcable. If needed, look up double-acting pneumatic valves with at least 1" bore and 12" stroke or bigger. Make sure your connectors and fittings are matching. There is no fixed parts list to achieve this since you can do the same thing with a multitude of parts!
Low pass filters can be simple to make. You just need to use a resistor and capacitor. However, you will need to apply the RC equation to get the voltage as smooth as you want.
This is the fun of researching and looking through various distributors and suppliers. You can't get part numbers magically. You will have to know what your requirements are such as voltage input, drive method, air connector diameters, etc. There are 5/2 and 5/3 valves that would do this, however, you would have to brush up on pneumatics as a field to appreciate the entire concept. If you don't know where to start, I would suggest finding tutorials and books about this.
The linear potentiometers are called Magnetopot from Spectra. These are driven by magnets. They are slightly expensive but fit this purpose nicely.
Finish the Slouch Alert and Make Noise!
Wearable Electronics Class
Because pneumatics can provide much more torque, stability, and velocity. You woild not even want to think of a screw drive linear actuator. That would not be enough to simulate the motion profile of many planes.
Functional USB Flash Drive Rubiks Cube