My rear body mounts are totally rusted away. Got two new ones to weld on. Do you have to support the body or wil the other mounts hold it ok to replace one at a time? Also iv not had a proper look yet but i am assuming that the cross member could well be rotten too? Is it just a case of removingthe bumper to tell? if so i can investigate and get a cross member and weld it all up at the same time. Thanks for any help