'32 truck cab masurement request

I need the measurement of the distance from the bottom of the beltline on the back of the cab at the center to the bottom edge of the body. Reason being, I have a cab that needs patch panels all the way around and I have no reference as to where the bottom of the cab was and I'm trying to get it all braced up and a subfloor built for the channeling. Any other guidepost measurements that anyone could provide would be great. Thanks in advance...

 

My 34 is 25 1/4" I hope that is helpful.

 

cool... that's perfect - thanks!