I'm not sure if it'll be exactly right for your '54,but assuming AD's were pretty much alike, the rear bumber would normally attach straight across the side frame rails using the stock bumper brackets.That is it would have a center point between the rails and parallel to the bed.On mine there is considerable space between the bumber and bed.On the front mine had the apron tucked a little into the front bumber using the stock brackets.I have no pics ,but there are plenty on this site.
