The only sealed beams worth using (and in fact, the only cheap 7" round headlamps worth buying) are [ame=http://www.amazon.com/dp/B000H29WN2]these GE Night Hawk H6024NH[/ame] items. They're still sealed beams; you still throw them away when they burn out, but at least they contain decently powerful burners and reasonably new optics made on tooling that isn't worn out and decrepit; none of that can be said of any of the sealed beams from Sylvania or Wagner, or any of the non-Night Hawk GE units.
If you're seeking upgraded headlamp performance and/or appearance, see the link in my previous reply in this thread and/or send me a PM if you want more detailed help.