Hello Roland.
The confortable ride is not problem for me because I don´t use my spider as a daily car, I only use it inthe weekend for fun.
The big problem is the extra stress and also the noise.
“changing all rubber for new rubber except for the rear trailing arm trunion which I have been told to replace with Montreal harder rubber trunions.”
Are you referring to the “T” arm bushing on differential (two conical pieces) or to the trailing arm bushes (four pieces)?
Where are you going to buy the bushes?
PD: I have seen your duetto photos
. Good luck with the restoration.