5.0 has skegs built into the hulls and a loose footed main (no boom), the 5.2 has dagger boards and a boom (and thus a gooseneck).
I think it would be a challenge to get a 5.2 sail to work on a 5.0. Aside from dimensional issues (foot and luff lengths, the way the clew of the sail is attached to the main sheet/boom is quite a bit different. Of course, nothing is impossible with enough time and money...
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Jeff R
'88 H18 "Jolly Mon"
'10 C2 USA1193
NE IN / SE MI
cramsailing.com--