OK so ive ballsed up the back arches,tried cutting the lip out to stop the scrubbage a. went a tad bit mad with the grinder... on both bloody sides... aint to bothered though the window lip is slowly rusting away anyroads... How hard is it to change the full back section? or is there an easier solution....wouldnt be that bothered but the passanger sides must have had a replacement in the past? any suggestions ? help much appreciated? oh an i aint commited to the straight arches so if any u gguys have any ideas on diff arches then more than welcome... regards gareth p.s if your home boilers on the blink id be glad to try an help u out