Rustys steering sucks and probably shouldnt be used under any circumstances imo. Their axle trusses are a joke. Their high clearence long arms suck and are also a joke. Their old leaf springs flat out sucked, which is why they started having someone else make their leafs.
They do how ever offer some good products. I run several of their products on both my DD and my trail rig. Gotta love their poly tranny mount, good leafs (the new ones), great coils...
Id call back and talk to someone else, try and get rusty himself if you can. If its truely a problem with their trac bar they better fit it, if you ordered the wrong trac bar for your lift then they are at no fault.