I have never seen a factory bbd with a thin gasket, the thick one is the proper one, it insulates the the fuel, maybe the current new ones are thicker that the factory.
If so, someone must have changed the carburetor studs sometime in the intake's life.
Teeth & Tires, how long are your current studs, and how many inches are they off? I have some spares and can check to see if I have the right size. If so, they're yours for shipping.