How do I un-jam my seat belts? Help!

tonysrt said
My 74 Duster has the exact same problem. But not knowing history of car, belts have been replaced because they are black and interior is tan.

Maybe not. I have seen several cars that did not have color coordinated belts, usually A bodies. They seemed to run out of colors and default to black. Usually with green and blue interiors. Just from observing parts cars in years past, FWIW.