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Just looked up and it looks like the Insight 5th gear is drop-in for the first-gen Fit, possibly second gen as well. The needle bearing for both of them is 35x39x24mm. This would drop 5th gear from 0.757 to 0.710 and highway cruising RPM (65mph) from 3100rpm to 2900rpm - not huge, but 6.5% is nothing to sneeze at.
My guess is that both gear shafts would probably drop in with minimal modification, but I don't think the Fit is appropriately powered to go from a 4.3 FD to a 3.2.
I just happen to have an Insight transmission laying around.
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