There are 3 basic vent window offerings for the 73-91 trucks.
1973 - 1980 - non-locking latch with a large glass that ends with a point. These use a 2 piece gasket
(click here for gasket) and mount to the door with 2 bolts at the a-pillar
1981-1985 - locking latch with a smaller glass that ends in a curve at the top. These use a 2 piece gasket
(click here for gasket) and mount to the door with 2 bolts at the a-pillar also.
1986-1991- Locking latch with smaller glass that ends in a curve at the top. These use a 1 piece gasket
(click here for gasket), and mount to the door with only 1 bolt at the a-pillar.
Here are the pictures for identifying them.
Note the differences in the 81-85 (top) and the 73-80 (bottom) glass:
Close up of 81-85:
73-80:
Note differences in the 81-91 locking latch (top) and the non locking 73-80 (bottom)
Note the differences in the top mounting boss from top 85-91 (top) to the 81-85 (middle) with hole, and the 73-80 with hole (has a bolt in it so I won't loose it)
From top to bottom 85-91, 73-80 and 81-85 inside view (81-85 is missing the latch handle)
From top to bottom 85-91, 73-80 and 81-85 outside view (81-85 is missing the latch handle)
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