I didn't write down the measurements because I ran the numbers while I was doing it, but the math goes like this:
The cab is mounted with two mounts on each side (front and back). The fenders are mounted to the cab and the core support (which has one mount on each side.
Distance from the core support mount (front of fender ) to the front cab mount: 42"
Distance from the front cab mount to the rear cab mount: 23"
Height added to the rear mount: 3/8"
The front mount is 42/65 (64.6%) of the way between the core support mount and the rear cab mount. So I needed to add 64.6% of 3/8" in the middle to put the three mounts back in line. That works out to just under 1/4" according to these measurements.
The drawing below is not to scale, but it hopefully illustrates the problem. The initial change (just raising the back) caused the cab to deform in the door openings enough to be a problem.
I did check in the FAM and those three points *should* be a straight line.
