If you know Duesenbergs, you probably have heard of Ema. Obviously, I'm still learning, as this is all new to me

Ema has restored 52 Duesenbergs in his 30 years in business; six Model Js restored by him have scored first places at Pebble Beach Concours d'Elegance. He reckons he has 28,000 original drawings and 1,000 patterns to make Duesenberg parts. "We can make exact reproductions, as opposed to those which look okay and are a testament to the success of guesswork," he says.

http://www.bloomberg.com/news/articles/2006-05-31/lenos-latest-duesie