My '70 c20 I had in highschool had a factory chrome spotlight on the windshield pillar. Worked great until it fell off when I was driving down the road!
Here's my list:
am/fm
speed warning
tach
tilt
dual horns (not really that rare)
dual battery tray
manual throttle (again, not gold but nice to have)
"GM" choke hole block off plate
bumper guards
did someone mention tow hooks??