Some folk want to change 67 Camaro or Firebirds to 1968 or 69 doors.. // generally to get away from the vent window or to get one etc.. whatever..
Its not that easy..
Here is a picture for you of the two types of hinges used.. for 67 & then 68's....
They do not interchange without structral changes to either the body or the new doors..
FYI.