One is from 2009 and doesn't have DTL etched on the window (the one shown in the pic; box is front right). The rest are a year newer and are identical, aside from the fact that they sport "DTL" etched on the window. All of these worked fine, needless to say. Thanks Ryan!
Your welcome Mike
On the unit that does not have the letters DTL in the window, notice how the serpentine pattern on the cadmium eye is more of an orange color than the others, which are a maroon/dark red color.
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On the unit that does not have the letters DTL in the window, notice how the serpentine pattern on the cadmium eye is more of an orange color than the others, which are a maroon/dark red color.