47 Ford bumper frame mounts

[Topher5150]

I'm thinking of a design for a bracket for some large caster wheels to move a 47 Ford onto a trailer with no rear axle. I was thinking about mounting them to where the rear bumper mounts, and I can't remember are the bumper mounts on the frame threaded, and if so what size are they?

[RalphM]

There are two bolts on each side of the frame that holds the bumper braces on. The bolts are half inch national fine and are spaced three and three-quarter inches apart on centers
They are also on a slight angle upwards towards the front of the car
There are nuts on the backside, they are not caged nuts like the front bumper bolts are.

[Topher5150]

excellent thank you...do you know what pitch that is???

[RalphM]

20 tpi
But you could use any half inch bolt or nut because it’s not attached to the frame, or doesn’t appear to be.

[Topher5150]

some reason i thought there was a nut attached to the frame

[RalphM]

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Pinch nuts on back side.