Just in case anybody is interested in this kind of stuff, I've found out that a very patient scholar has put online a sort of listing of the contents of the propers of 1966 Missale Ambrosianum (which is the parallel of 1965 Missale Romanum).
Propers are identical to those in the 1954 Editio quinta post Typicam. Differences between the two Missals are only in the Ordinary and in the rubrics.