It's been over 10 years ago since I swapped a 75 front suspension in my 1960, so I can't swear to it - but I believe the shock dimensions are the same from 1960-1983??, but the 60-62 uses a metal inner sleeve to reduce the rubber bushing diameter from the size of the later mounting stud, to the smaller size of the attaching bolt used in the earlier setup.
In my application, I originally used the 1960 shocks (they were relatively new) with the new suspension swap. When it came time to replace them, I just pushed the sleeve out of the 1960 shock and pressed it into new shocks designed for the 1975. If I remember correctly it's only on the upper mount. In looking back at photographs it appears the lower shock was already mounted on a stud.
