71 Duster rear seat belt positions

Uncle Bob said
My 71 Duster did not have rear seat belts when I got it. Now I've got a set and was wondering which belt half goes in which position? There are 6 separate belts making the set of 3, and they are not sewn together like the factory belts.
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There are four mounting points for the rear seat belts, so if you have 3 sets the center set of belts would share the center two bolts with the right and left side sets.

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