Picture of seat hinges -HZ - top one in picture has stopper - from van / ute -
Seat hinges.JPG
Seat hinges1.JPG
have not added picture other side of seat but are the same no stopper on all models
I hope this helps someone, Also to remove plastic outer without damage, very difficult, most seem to be slightly damaged, use a tube spaner to remove with the hinge then drill out dowels, Good luck