Ulf (65dartcharger) has over the years with his connections at Chrysler compiled most all the breakdowns by number produced for all models of the 65 Dart. These numbers are not applicable to 63, 64 or 66 Darts or any Valiants.
i pulled a rack from a 65 Dart last Autumn. At Every mounting point the factory installed nutcerts (1/4 x 20 IIRC). The corners all had rubber cushions as did all the cross pieces (long rubber cushions all the way across. The corners had 2 machine screws per corner and the cross pieces one on each end. When I set my other rack up on my wagon I made sure everything was equal side to side and set it where I wanted on the front to back measurements. Hope this helps