i can tell you from first hand experience... they are different.
3 door rears are mounted at a different angle, and are mechanically locked at the angle of a 5 door pillar.
the mountings were slightly different (altogether the locating lugs could be bent, to fit) and for me, the fastening at the end of the front belt was different. Mine had a metal ring at the end, the 3 door annis i was trying to fit, didn't.
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