Chrome front bumper,
anodized aluminum grille and headlight bezels,
"Custom" panel on b-pillar,
chrome trim around windshield,
deluxe steering wheel,
chrome knobs on dash panel,
upgraded bench seat,
aluminum side trim on front fenders and cab
deluxe heater,
arm rests,
wiper washer,
radio
If you go to this link and look at post #14 & #15 you can see a restored 66 with the Custom Cab Option.
http://67-72chevytrucks.com/vboard/showthread.php?t=439322