I contacted Orap and this was their reply (subject to Google Translate):
"Good morning,
following your request we are to communicate our best offer as follows:
Sachs shock absorber overhaul with electric control Euro 350.00/each
If, on the other hand, they are traditional shock absorbers (with electric control), the overhaul costs 200.00 Euros/each
Prices are inclusive of VAT and transport
We remain at your complete disposal and on this occasion we offer our best regards"
I would have thought they would know the difference between whether Sachs or standard shocks, but it's a start.
Nagengast.pl are well known for their work on Ferrari and Audi systems, but I have heard some who advise avoiding any refurbishment.
The problem is what to do to keep these cars on the road?