What year did the F series go from the glass headlights to the plastic ones and then what year did they put them on an angle instead of the straight ones. I know the glass headlights body style started in 1980 and i know the 96/97 was the end of the old body style but I'm not sure on the rest. RB

 

92 for the angle front end

 

87 was the beginning of plastic headlights I do believe.

 

So 80-86 87-91 & 92-96 correct?

 

really 92-97 with the 250-350 keeping old front end.