Rather than risk the chance of getting the wrong one, and having to go back AGAIN, suggest you take the old one, or what's left of it, with on your trip to get the replacement. When selecting the replacement, pay careful attention to the hinge area. If it's not a match there, it's just not going to fit!
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake