The back glass from any 1978 or newer El Camino or Caballero will work.
yup...
all of them will fit from 82 to 87
yes
No.
yes
Yes
No, they will not interchange.
Yes
A standard Chevelle frame will not fit an El Camino as it was based on the station wagon frame
No, 2 differen't body styles.
No it will not fit......Jack
Doors from a 1978-87 El Camino or GMC Caballero