Download the full alpha and install it. Then rename the AH2 "sights" directory and copy the alpha directory "sights" into your AH2 directory tree to replace the renamed folder. Then all aircraft will have their historic gunsight associated to them. Right down to the evil Brewster and the Aussi spit8.
Or,
Pick and choose the ones you want and copy over the "gunsight.bmp" and it's "gunsight.mil" control file.
All of the gunsights begin with a country 2 or 3 letter designator.
Example:
deRevi16.bmp
ukMKII.bmp
auJ178.bmp <--- evil Aussi gunsight
There is even a dot and a tiny cross which were the only ones of their kind used in ww2.
N9 or K14A with rocket aid is one of two and remember you have to send him the mil files along with the bmp.
usaN9Mk8rkt.bmp ----- usaN9Mk8rkt.mil
usaK14rkt.bmp ----- usaK14rkt.mil