When I checked last spring for 74 GTO parts, there was a salvage yard that had some 74s on hand in Oklahoma. Place is called East West Auto Parts,Inc. in Tulsa phone them and see what they can do for you --- they even ship parts to your door. 1-800-447-2886 or e-mail them
www.pontiacpart.com
So that you have an idea of their pricing, they wanted $175 + s&h for the shaker off a 74 GTO.
michael