As stated above, the vertical defroster lines aren't all that rare, since all '70, '71 240z had them, as well has '72 240z's built in or before 12/71. The hatch vents, and side emblems are only found on series 1 cars, so you could say they're rare. The knob on the gas door isn't really rare, it's found on all '70 and '71 cars. Depends what you call rare, I guess.
Some other parts that are only found on the series 1 cars (like yours), are the steering wheel, dash (glove box lock is different from later '71 dashes), I believe the map light, seats (I think), and depending on the build date/VIN of your car, could be quite a few other parts.
Logan1, what is the VIN of your car? Just curious.