As many people are aware, Duane Heckman is the reigning 'Documentation Emperor. He can basically decode any piece of GS documentation you can throw at him. He can be contacted through his website - http://www.classiccarinteriors.com/. I am maintaining a registry for 'documented' factory Stage1 cars. Please see this V8 Buick post for additional information. Also, we are trying to compile the most complete list of Buick dealerships/dealer codes possible. Please see this V8 Buick post for additional information. Thanks for the interest everyone!