If you have water in the light, chances are the adhesive seal is completely gone, and when you go to replace the light, the lens will fall off the reflector/bulb assembly. I've seen this happen.

If you replace anything, I would replace all. I'd recommend Sylvania Halogen XtraVision low beams, and Wagner BriteLite high beams. The Sylvania Halogen XtraVision headlamps are by far the best sealed beams I've ever seen; they are not only brighter, the beam pattern is dramatically improved as well. I couldn't believe the difference after I put them on my 744.

If you have a fat wallet you could go entirely to the Sylvania Halogen SilverStar sealed beams, available in high and low beams. They have the same beam pattern as the XtraVisions, but are brighter and very white (not blue, very white). I think at Autozone they are $15/light or $20/light though, the former mentioned setup are about $10/light.

You take care of that 745 and you'll have no problem reaching 250+K. My 764Ti had 270005 when I totalled it, and it had so much more left.
--
Cullen Wassell in Newmarket NH
1989 744Ti 112k
Bone stock as of yet