Ciao Supermario,
I did write the "standard works" for aircooled 911 Turbo
https://www.pca.org/news/2017-04-07/book-review-porsche-911-turbo-air-cooled-years-1975-1998
and the "standard works" for the 911 Speedster:
Porsche Speedster - Legends live forever 1989-2011 - Speedsters - a site dedicated to all aspects of Porsche Speedsters from the 1950s to the present day
So you can expect to find all details that you are looking for in our new book project.
It is about the 911 G-model (my 1974 - 1989).
It deals exhaustively with all six limited editions of the G-model, some of which are completely unknown even to connoisseurs.
There is an interview with the „real saviour“ of the „Eleven - the man who campaigned to crucial effect for the survival of the 911 at the end of 1970s, when it was due to be replaced by the Porsche 928.
Here you will find a sneak preview:
Books » BMB Berlin Motor Books