Unfortunately it is true, the residual motorcycles from the war are almost all been modified in Italy.
When the war is ended, they have remained in Italy a lot of motorcycles English, the great number of these motorcycles was constituted of BSA M20, the Italian motorcycle industries were without job because their industries were destroyed .
2 factories of Italian motorcycles, the Gilera and the Benelli, after the end of the war they started to build accessories to make comforting for the motorcycles with the rigid frame, because after the war the people could not purchase a new motorcycle and they modified the motorcycles abandoned by the other armies, this has allowed the Italian factories to work and to the Italian people to have a renewed and comforting motorcycle without spending too many money.
That's why almost all the motorcycles English in Italy are heavily modified.
I am looking for a Norton frame because I also have this problem with a H16 model
Davide from Italy