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I ran across one of those "what changed each year" articles for square bodies and it said the front deflector under the bumper was not available until '81. That was the same year they made some other front end changes, so it makes sense.
That makes sense Stewart. How would you block off the grill? Plexiglass behind it? Would the lack of air flow cause overheating?
Thx VZ, the earliest I could find was for a '81, so I made the leap and bought it. Doesn't really fit my '78 bumper profile perfectly.