Basically in the IH Built Models
Original
70,100,71,102,122,123,72,104,105,124,125,73,106,107,126,127,147 - Narrow Frames. But the 7hp, and the 100 have a low tunnel, and I think all the rest are high tunnel..
86,108,109,128,129,149,169, 800,1000,1100,1200,1250,1450,1650 - Wide Frames. There are slight differences between the 1x8/9 and Quietline frames, but they are basically the same....
482,582,582 Special,682,782 - "Spread" frame - Similar frame to the wide frames, except in the front where the engine goes, the channels are lower, and wider so the boxer twin engines could fit....
982 - 1st Super.... frame is ~6 inches longer in the tunnel area..... but the same as the other 82 series except frame.