TT Ford truck wood wheel hub bolt size

[Flivverking]

I'm looking for the dimension size of carriage type hub bolts used on the Ford TT trucks.

Maybe they can be used on my '27

Chrysler wood wheel hubs...

3/8"x 2-1/4" , thread probably 16? Is what I need.

 

I'm having trouble finding "part thread" style carriage bolts(smooth shank under head )from online fastner suppliers in my  size range.

 

It's nice to have the old high profile round head but I will concede to regular low profile head for the correct size bolt on this car if somebody knows of a supplier.

 

The TT Ford truck bolts offered look good ( with proper crown head) but a bit long .I could chop them down if needed if the correct basic size.

No Ford parts dealer has listed the actual size for these Ford TT hub bolts.

Thank you.

DMS.