Anyone replace window in RV door with deerview?

I bought a RV door off of THF in late 2013 and I would like to replace the opaque window with Deerview windows, likely the vertical sliding window. It would be a real hassle to take the existing window out to measure for a new one considering the blind is 13' in the air with no porch.

Has anyone done this, preferably with the 5' x 22" door sold here a little over a year ago? I would love to get those dimensions if I could it would be a lot easier.