The front cab mounts in the frame are basically flush with the top of the frame and the cab reinforcement that supports the mounting bolt loads is approx. 3/4" deep in the area above the frame. There is a rubber pad between the two so 7/8" to the bottom of the cab in that area should be pretty close. I used a piece of 1x4 set on the frame to provide an initial elevation during the installation of the rear cab mounts. Note that the bottom of the cab has a lot of different heights so it is important to measure in the specified location.
