Assuming you have the original retainer rings to hold the lens to the buckets, you can take the light assemblies from most any 4-light system cars with round lights (60s/70/s) and install them in your buckets. Sometimes you may find a problem with the light being "double-refracted" (if that's a word). You see, the sealed beams lens sends the refracted light out throught the original lens which refracts it again sometimes dimming or difusing the light so it looses its focus and you loose your night vision. You night find a way (like tons of duct tape ) to mount the original lens temporarily i front of the existing sealed beams and see how it works at night.
I love technology.