Replacing Headlights

Plymouth Voyager, 98, 112K, 3.3L:
BACKGROUND:
The lenses of both headlights have gotten cloudy; neither Hi or Lo beams put very much light on the road. I am under the impression I have a sealed beam unit on the voyager. For safety reasons, I would like to purchase some replacement headlights that fit and offer increased visibility.
QUESTION:
From all the different suppliers how I be sure I am getting headlights that fit my Voyager and that put more light on the road?