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All lefties have clamps designed to mate with 1.56" steerers except the new single crowned occhio which has a 'normal' tapered steerer.
So yes, any lefty - as long the vertical clamp spacing is tall enough - will fit your frame. And because way back they all used the same head tube regardless of frame size it's easy to fit an old lefty to an old frame - the only thing you need is the steerer and you don't need to worry about spacers and whatnot.
If you really want one I'd look out for one that works! Something from 2008 onwards It's probably impossible to get a really old, really broken one working again now.
Is it possible to fit a lefty (1.5" headtube) to an older Cannondale with 1.56" headtube?
Instinctively I'd say yes if the steerer tube diameter are the same (or the inside diameter of the headset bearings) but just don't know.
There's a fossilized lefty on eBay, I'm mad/enthousiast enough to attempt a revival Howard style. But if it doesn't fit my f1000 then I'll leave it :)