I had the same issue. I took out the floor shifter and reinstalled the column shift. I was able to pull the shift linkage off of a donor that was a 64 f100 (non-unibody). If I remember correctly, the shift linkage from 61-64 will work. 65 and 66 will not. I will measure the two rods tomorrow and post a reply. P.S. this site has a user named "Number Dummy" that can give you the actual parts numbers for these.