While doing some work on my 401 yesterday we checked this area and although the aluminium is a bit corroded indications are this area was riveted.
Though the car had been repainted several times there was no indication of any structural work having been done on it previously and it had been off the since the early 70's.
Also checked a spares car again off the road since the late 60's, although rough in that area indications are again that rivets were used rather than crimping.
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