Have you tried Revell at http://www.revell.com/support/. You need to go to "Need Parts?", and order them. They are not listed in "Instruction Plans".
Or, call Customer Service at 800-833-3570. Don't even bother emailing them.
On the Bench:
Revell 1/96 USS Constitution - rigging
Revell 1/48 B-1B Lancer Prep and research
Trumpeter 1/350 USS Hornet CV-8 Prep and research