These papers  define the dimensions and essential running gear. They probably had to be resubmitted for each new model - but exact details are unknown. Perhaps for each different engine size?

While readily available for the Flaminia, Fulvia and Flavia, these documents for the Aurelia are rarely seen. Shown below are the papers for two Berlinas, the B21 and B12, and two B20’s,  first and fourth 4th series.

Thanks to Luigi De Virgilio for furnishing these.