ring pumaspeed if your doing a conversion; rear quarters are £150 compared to over £800 new for ford ones
youd be looking at over £200 per panel and i doubt anyone will have spare rears so youl pay for it if they do!
pumaspeed stuff is all fibreglass but £1000 gets you everything. oem bumpers are fibreglass anyway, fronts are ali so you won't beat that but rears are steel, they weigh a lot and rust!