This chap may have the n/s/r door as well?
http://www.ebay.co.uk/itm/Fiat-Croma-1-9-Diesel-Estate-off-side-Rear-DOOR-/110992303866?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19d7a826fa
HTH
I Emailed this chap, he said he is breaking the whole car