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There is a slight difference between the 68-A and 68-B window frames. I doubt if most people will care, but the 68-A doors with the wood structure supporting the window regulators and door latch mechanism had a small window stop bracket at the rear of the door. This stop engaged a small tab on the window frame to ensure the window would not extend upward too far. The window frame was changed when the wood structure was replaced with steel ant the rear window stop was eliminated.