[nickyt]

Aerosus is a supplier which has German and UK websites.

Arnott is another supplier which has US and EU websites.

Unknown shocks can be found on Alibaba.

I even see the air shocks being sold on Amazon.

google.com/search?q=audi+air+suspension+self+study+program

There is a voltage that is applied to each shock to control the stiffness. This voltage needs to be checked at the shock itself.

 

[nickyt]

I'd rather not fit after market shocks.

Then it is time to pay the dealer price. We have never located an OEM aftermarket supplier and people have been looking since 2004.

yes air levels work fine. hardly any difference between sport and comfort mode. it feels like there is no rebound dampening.

The ride height and the stiffness/dampening are two separate systems.

1. The height is controlled by how much air is in the air bag.

2. The stiffness is controlled by an electrical voltage applied to the shock/strut assembly, located in the center of the air bag assembly. If this voltage is not there, then the shock "stiffness" will not change.

For your problem, you need to check the voltage applied to the each shock and to see if the voltage is changing between comfort and sport mode. Hint: it should change.