If you look at the "cub" bike they sell, it is a clone of the late model Z50R. I specifically e-mailed them to confirm they had one, and "hopefully" they were being truthful with me. If it fits their cub model, it should be close enough for my project.
I don't know if the tank has the cub logo on it, but if so, it should not be that hard to remove, or repaint to match my scratched up plastics!