Van's instruction call for a couple layers of cloth to be applied to the inside of the leg fairing and cured in place on the gear leg. So I wrapped the leg with electric tape and waxed it with release wax. Then I laid up 3 layers of fiberglass and resin and installed the fairing to cure.
Result was a pretty nice custom and specific fit of the fairing on the leg. This is where the clamp will be to hold it on. I left the fairing longer than shown on the drawing so the hose clamp will be completely hidden inside the nose gear fairing.