COEs vary is size by quite a bit . . . the difference in cab height and wheel track width is significant between the'48 Chevy COE and the '53 GMC COE (as in 10 inches in height / 6 inches in width) that I have - we will need a VIN# to provide accurate information. If you are an inch off in the wrong direction . . . only a sledge hammer can fix it at the last minute before the trailer / container / boat leaves.