cross members
The 1964-67 frames are about 1.5" narrower than the 68-72 frames, which is why headers for the early cars are harder to find. The motor mount frame brackets mount in the same places, however, and are even the same part numbers from 1964-1968.
The trans crossmembers are narrower on the early cars. In addition, crossmembers from cars with boxed frames (converts, HD frame option, and VCs) are narrower than those for the other body styles with open section channel frames.
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