I have recently done a small bumper conversion on my 73 comet.....but the damn thing wont sit straight. Its bent downward and it seems like no amount of pressure or adjustment can be made to straighten it short of cutting the bumper brackets down and drilling new holes Anyone else had these problems with a 73'? if so how did you correct it? and how much trouble is it to convert a 73' to the 71-72 front valance/apron(just bolt on?)