Universal Retrofit kits to fit your Antique Knobs in any modern Pre-Drilled doors. The best value for home owner or Contractor installation. (#1 Oil Rubbed Bronze) (Passage 2-3/8) Universal Retrofit kits to fit your Antique Knobs in any modern Pre-Drilled doors. The best value Options: Standard Passage or French Door Set and Privacy which should fit most doors and all knobs Passage will fit doors of either swing, Standard Privacy set are for doors that swing into the room. Privacy kits for door that swing into the hall, you will need to Non-Standard Privacy kit. Most interior door require 2-3/8 Backset, however, a few interior door may have 2-3/4 backset