Product Description: 1960-1973 GM Motor Mount 6 or 8 Cylinder
Measurements:
The inside diameter is 2-5/8". It is 1-3/4" from the bottom to the center of the slide through hole.
The frame mount holes are 2-5/8" apart.
For more information, follow the link: 1960-1973 GM Motor Mount 6 or 8 Cylinder