You can probally get new cab mounts from Steel Rubber in North Carolina.

http://www.steelerubber.com/

They also provide re-vulcanizing services.

Jake

1960 GMC 305A V-6 Gallery Page
Remember, the government cannot give --anything to anyone --that they have not first taken away from someone else.
BUY AMERICAN http://www.stillmadeinusa.com/index.html