Hi Brian
I suspect the pistol port protectorscopes in the M5 etc are the same. The drivers and gunners protectorscopes in the M5 etc are quite different to the Stuart Drivers and Bow gunners scopes.
The pistol port scopes I cast are optically perfect if I put in enough work to flatten them of and polish them . The issue is that I have no desire to put in the twelve to fourteen hours necessary to do to the six pistol port scopes when I can pay sixty dollars and get acrylic sheet professionally cut and polished.
The drivers and gunners periscopes on the M5 etc are all standard 346
https://www.marstar.ca/dynamic/produ...roductid=82590
of which the Stuart had One up until the late production M3A1s which had two in the turret .
The pistol port Protectorscopes are quite different and so far as I can find unavailable.
The M3 turret had a direct vision "peep" hole system that consisted of a thick piece of flat glass. The later M3 hybrid and M3A1 turrets had a periscope like device instead.
The driver and Bow Gunners Protectorscopes are made up of two mirrors and two windows all of which are separate components and separately replaceable .
I don't have part numbers for any of the components either for Pistol ports or front hatch scopes.