1983 Ram W150 Driver's Side Headlight Bezel (Black)

How can I identify the differences between the 81-85 vs the 86-90 ? Like YYI, I have not noticed the difference. Appreciate the education.
The 86-90 bezels made the turn signals a little oblong to fit with the new grill style. Like in this picture below, unlike mine (pictured above) that is symmetrical all the way up the bezel.

Bezel.jpg