Subframe Mount Diameter

I'm have the rear body mount on my new-to-me subframe repaired. Does anyone know the diameter of that hole. We mesured the other side, but there is a little rust on it and we want to know the exact diameter. It is a 73 frame I'm putting in a 71.

The shop manual for my 74 does not show the hole dimensions but I wonder if this would work.
Do you have new bushings ?. If so measure where it is stepped down and this would be the hole dimension for the frame. I'm also thinking that the firewall base bushing holes are the same diameter but take different thickness ones.
Jim

I ordered the GW solid bushings. The guys at ATS said they were 1.460 inches at the step down. I'm guesing a 1.5 inch hole. I'll measure the left side and the front holes and assume they are worn a little larger than spec.