[gt40racing]

I just found this also: the cargo lamp became available in mid 69, and was included in the CST package.
From the dealers books;
Stepside pickups and Cab/Chassis trucks;
Full depth foam seat with delux vynl trim
carpeting
door trim panels
chromed front bumper
Cigar lighter
Headliner
Cargo lamp
Bright condtrol knobs and pedal trim, rear window trim,wing vent trim,and windshield moulding trim
CST fender name plates
Bright side marker lamps
Door operated dome light switches
special insulation.
Fleetsides or Longhorn models, add...
lower body side mouldings with wood grain inserts
Wood grain tailgate panel
Tail light trim
Bright fuel filler cap.