[Chevelle-List] subject: rarest option for your year of chevelle ?

[Z16CHEVELLEGUY]

I'd like to know what everyone  thinks or knows is the rarest options for
their year of chevelle.how about giving the name of the part, option
code,what was the function of the part, and maybe the GM part number. also if
you happen to have that option and if not what would you pay to own that
option? lets limit this to factory or dealer installed options only.
                                                larry