JC Whitney 7" Headlamp Conversion?$45.99

I got the old style sealed beam type halogen headlamps in the
Duster. You should still be able to get them from your local
parts store. Just remove the orignal lamps and Install them.
Same wire connector on the back.

Agree with Bryan.

Sylvania has a sealed beam halogen that is a stock replacement bulb.They are much brighter than the original sealed beams.Something like $10.00 each,and your done.