I put this up about two years ago in my restoration thread when I was deciding on which way to go, as there were reports of a similar issue on Viva Lancia:
"A set of Spax shock absorbers finished it off. It is worth knowing that the part numbers listed by Spax would seem to be incorrect, the difference is in the open length:
G434 Front 357 (as listed)
G3312 Front 332 (as required)
G677 Rear 441 (as listed)
G3318 Rear 426 (as required)
See this thread
http://www.viva-lancia.com/lancia_fora/read.php?10,5652,5652#msg-5652 "
I called Spax and confirmed the situation at the time and found them very helpful. There are a couple of other threads on Viva Lancia as well, just search for Spax.
Hope that helps
Neil