Official Ferrari site states that Mondial T had chassis with internal reference type F108AL/D, while the Cabrio version had F108AL/DN. Other sources (including 1989 Ferrari Story magazine n.19) say the two chassis were respectively named F118AL and F118AD. Looking on spare parts databases, I also found references to F118ED and F118EL codes, but I don't know what they mean. I'd really appreciate if someone could shed some light on this matter
Here's an interesting thread that might help. Try contacting some of its contributors directly? https://www.ferrarichat.com/forum/threads/ferrari-chassis-types.245964/ Don't miss the other thread within: https://www.ferrarichat.com/forum/threads/ferrari-chassis-types.245963/