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not sure on the socket size but really simple to do four bolts for each front seat, two bolts at the front of the rear bench seat pull it out and that will reveal the bolts for the back rest
And when refitting, hand tighten each one, leaving all relatively loose until all are in. If they won't hand tighten, DO NOT FORCE them or you WILL strip the threads off the bolt
I think the bolts are made of compressed cardboard or summat similar
not sure on the socket size but really simple to do four bolts for each front seat, two bolts at the front of the rear bench seat pull it out and that will reveal the bolts for the back rest
And the backrest is held by clips at the top, and needs a punt UPwards to release it