If a radio prep option was noted (M440, 441, 490) then no radio was optioned since the prep was included with the radio.
M418 was retractable front seat belts for USA and M419 similar but I assume not for USA. One has to be careful with such options because the Country equipment codes (Cxx) can mandate certain "options" which will then be on all cars for that market and not show up as options on the list.
If you have a CoA (or equivalent) I would love to see it (you can send it privately) this aids my research into options and several other things. I provide my own versions of the CoA by purchasing data on behalf of clients. My table of options is by year, this is due to variations in the options on a year by year basis so one cannot assume the options are the same for all years.
Dave