When I installed a four in my 68 I used a 74-78 transmission tunnel. Same as the one on left in this picture.
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The one in center is a pre 9/72 with a floor shifters. Here is the 9/72-9/73 three speed. 9/73-1/79 three speed has different boots. It was only used in the US 9/73-1/74 when the four speed started here.
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Obviously not familiar with the Todd OD. On my 68 the hand brake drum is almost touching the torque tube. I had planned on replacing the torque with the 7/72+ style which solves the brake drum clearance issue.
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One thing started to check out was the actual location of the torque tube on the frame. It may have been moved back a little. This could be an issue with OD. I know the Fairey OD does not have clearance with a four speed on a pre 9/72 frame.