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Join Date: Sep 2005
Location: New Westminster, BC
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What you're talking about is a headfoil. There are several brands available, Tuffluff (generally plastic) and others. The one you describe with a slot fore and aft is an older style, I forget the namebrand. It's not as user friendly as newer foils which have both grooves facing aft.
Your forestay should run inside the foil... its unlikely that the foil is acting as the forestay itself, but I believe there were such versions.
Since it's damaged I'd suggest going to a rigger and replacing it with a more modern version, of which several makes are available. If you indeed have a combined foil/stay, you'd really be better off replacing it with a conventional forestay and foil (or furler if you want). You likely won't find a direct replacement new.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)