Hot Rods 30-31 A Coupe measurement needed HELP!!!

I'm doing some body work on my coupe. I replaced the rear half of both Subrails, cross braces, ect. Now I'm working on the B post on the drivers side. I fabbed up the bottom 6" where the B post meets the Subrail.
Before I weld it all up I need the measurement on the inside of between the B posts where the dovetails are mounted. Any help would be greatly appreciated.
Thanks, Todd

 

Bump. Anyone???


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