Best thing to do is grind and replace them. They have probably changed the bars and the hook ups and the chances of finding an old set of bars that fit properly can be slime. Have a good shop do the work for you unless you are a qualified welder and grinder. Even then have somebody else do the work, it takes the guessing out of the problem. Reese is a brand name, how ever different manf. use different hook ups for there bars. One hint for you when you get your new load leveling bars or weight distribution bars here is an easy way to hook them up. Once you know how many loops of chain you need, hook them up BEFORE you lower the trailer, it makes it a lot easier than trying to bar them over after the trailer is lowered and you have to liiifft all that tongue weight. It will save you some skinned knuckles, sore backs and lots n lots of shady words.
C.