Just got my knock off cal-trac bars in and they seem to be very good.. heavy duty, decent welds,and powder coated...says made in New Jersey...only paid $155....and if I could have affordedthe real deal $476...I would have gotten them...my question is should they work with oem leafs or are mono-leafs or split mono leafs required...kinda on a budget and need advice....going on 71 duster with factory 6 leaf 340 springs....