Here's a linky:
http://www.zggtr.org/index.php?topic=659.0The fairing pieces are made of ABS. The bags and fairing inners are polypropolene.
One idea is to press some clay over a good tab piece to make a mold per se.
The make slurry out of ABS cement (or acetone? not sure now) and ABS shavings to pour into the mold to make a tab.
Haven't done this myself, but am about to try it with plastic on different bike model's tailpiece and to repair a fairing crack in a 2nd bikes.
If you're not concerned about cosmetics (the tabs aren't going to show with the mid-fairings mounted anyway), you might consider some strips glued up the inside surface of the fairing. You'll have to bend and tweak, but basically you need a sturdy tab(s), with a hole in it - all of which will hold one of the press on U-nuts.