grillzy - the radio you linked to with 40 channels is definitely not a dealer installed option for 69-72 because CB didn't increase from 23 to 40 channels until 1977. No such thing as a 40 channel until then.
Out of curiosity I checked a few of the brochure sites around the internet but couldn't find any that specifically listed dealer installed radio options for the years you are interested in. You might want to check them yourself, perhaps a general vehicle brochure shows what you are looking for.
http://brochures.slosh.com/index.shtml?1972
http://www.oldcarbrochures.com