If you found a 25" crt with a 90 degree angle it would work.
I'm not sure if the Star Wars factory 25" crt's were medium res or not, but they were 100 degrees so you would have to use a WG yoke on those.. an amp one would not work for that crt.
But you can use any crt made in an amp setup, as long as the neck pinout is compatable, and neck angle is 90 degrees. The benefit to a 'real' amp crt is it was medium res... but I had a factory amp Gravitar with a standard res crt as well.