Rotor Arm HUDSON 35-42 REO 35-40 STUDEBAKER 35-42 and others R40 IGB 1239
£12
REO 1935-40. STUDEBAKER 1933-42. HUDSON 1935-42. This shows a thick outer wall with a small lug inside. Images I have seen of the original Autolite rotor has a thin outer wall with 4 inner quadrants and a small lug.