Yes, there are kits for sealed beam to minature halogens available.
bulb
most likely problem is that the low beam side of bulb or sealed beam is burned out replace with a new one
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The cost of the bulb (or the light fixture, if you're replacing sealed beam headlights) if you do it yourself.
Need to specify which headlights you have... you either have the dual composite headlights, or you have the sealed beam headlight. In the case of the former, you rotate the harness 1/4 turn counterclockwise and it pulls out. You just replace the bulb. In the case of a sealed beam headlight, you have to replace the entire assembly.
You can't. You must replace the entire thing with another sealed beam. See sources and related links below to lookup sealed beam lamp numbers by vehicle make, model and year.
A sealed beam headlight is just that. The unit is sealed and you replace the entire light. A composite is made of pieces that's why the name. To replace a composite you put a new blub in the back.
Passenger side or driver side? BClear. The low beam is built into the same bulb as the high beam. Just pull the bulb out from behind the housing under the hood and replace it. If the low beam doesnt work you have to replace the whole bulb. They're not very expensive.
$12 + tax to get bulb from dealer. You can replace it yourself. Instructions are in the manual.
You probably just have a burned out light bulb. Look at the back of the sealed headlights. You will see two connectors, one for the high beam and one for the low- beam. To remove the light bulb turn the bulb holder counter clockwise until it releases. Replace the bulb and holder. Make sure you don't get oil from you hands on the bulb or it may shorten the operating life.