It's a long shot, but can anyone who has a '58 tell me where, exactly, on the frame are the four rear axle bumper mounting brackets located. The arrows are pointing to the two brackets. One is near the top of the rear tire hump in the frame and the other is toward the front of the rear tire, but I've looked in most manuals and books I have, but can't find any measurements. Can someone physically measure the locations for me--I need to attach them to a frame where they are missing. Much appreciated and indebted. Thanks, steve