I need a measurement from the door of a 60-63

[jonzcustomshop]

I am sectioning my truck, and I forgot to write down an important measurement!!!
In the pic. you can see the marks. I need the front & rear measurements of the door frame .
It should be from the bottom edge of the driprail to the top edge of the door jamb on the rocker.
I am thinking It is 51 inches(i was trying to measure the door), but I need to know the exact, and if the front and rear measurements are the same.

[fuelpump]

My 60 is 51" in both locations.

[jonzcustomshop]

Thanks fuelpump, I did my math, and that measurement gets me back on track.