Polyproylene film capacitors--only legend?

I think you will also struggle to find the resistors mentioned 1K43 and 316R are not exactly standard values. It looks like what they have done is selected a capacitor, measured it and then generated a resistor value based on the required time constant.
So do a bit of reverse engineering, calculate the time constant R14 * C3 with the given values. Then get a capacitor and measure it and then work out what resistor you need. You will have to make the resistors up with several values in series or parallel and measure them rather than relying on the printed value.

Then when you have done that make another pre amp with standard 5% capacitors and the closest 1% resistors you can get and arrange a double blind listening test. I would be astonished if you could tell the difference even if there is a difference in the frequency response curves.

By the way, what has this got to do with an Arduino?