A cross-reference manual was published by the factory years ago for some of the models of the time. The one I have only covers 180, 190, 220,300 sedans, also 190sl and 300sl models. It was publication #19005 "Ubersichtslatter Fahrgestell-Ersatzteile" (Survey Sheets, Chassis Spare Parts) 1963. Unfortunately it does not cover any W113 cars, but I suspect that there may be latter editions which do? It has nice illustrated cross reference tables which show what parts are used in common with different models and list part numbers.