Those are both gas shocks, monotube is just a more expensive design. See if you can find some non-gas shocks, the kind the 210 Sunny was designed for.

If a commercial place it was that said you are in need, beware. They always say that, even when you don't

Check it out yourself. Push down on the corner of the car, and let go, it should bounce one cycle. If it bounces several times, you need new shocks.