Please explain the differences and similarities among different years of front bumpers.
Some sources say 1978-95 are the same, while others break it into 78-91 and 92-95.
Are the differences purely aesthetic? Are bolt patterns the same, or do they vary among eras?
What about earlier years? (I know earlier years tend to be more difficult to find)
Someone hit the front bumper on my 91. I'd like to find a direct swap, and my research has not been very fruitful yet.