If you go to Carters or Bow Ties and Bits I believe they have pictures of the kits complete with bolts. I don't know the size of the threads but they are fine thread and the rear ones have holes through them for mounting small springs and cotter pins and you are correct there are six . You might have to purchase a set if you want to replace them. The kit comes complete with wood blocks, nuts, bolts and springs etc. Hope this helps. Bob T
