Thanks again Dave.
I spoke to my mechanic today, and mine is a Mark2 with a transverse leaf spring so it's a bit more difficult to converse the Nivomat sys to standard shocks.
He doesn't know how to do it properly so I'm trying to find something on the internet but all conversion descriptions I found are Mark1-s and 760s.
Don't you know a volvo specialist who has done this work before?
Thank you very much in advance.