EAI make some OK brake hoods but I have enough 80's Modolo gum hoods that fit to keep this group satisfied through the spring. Bicycle Classics also has a bunch that will work great too. Also brake pads are available from Kool Stop and Scotty that fit Campagnolo holders great.
Real Campagnolo Gum Hoods are still available (although not cheap) if the abovementioned hoods do not work for your particular project.
Most Campagnolo spare parts do still exist. Unfortunately these spare bits are for sale in today's prices, and not the price from 1974 that's stuck in most of our heads.
If there is a spare part or product that you think would sell at least 1,000 of within a couple of years, I can have any older bike part made for you if its viable. Contact me off list.
Bradley Woehl
American Cyclery
San Francisco, CA 94117
(415) 664-4545
http://www.americancyclery.com