Only other candies of that era had Toshiba tubes with the same physical dimensions. You might have luck finding a 27" Toshiba TV with a similar shape and short neck as long as the neck pinout is compatible. You'd need to swap the yoke as well because that definitely won't be compatible with the TV one. Beware of bonded yokes on TV's, major pain. I've heard you should use the rings that came with the TV, but have never been able to verify that. Good luck.
I've experimented with a few Toshiba consumer TVs, and they do not physically fit. Fuck a yoke swap and all that mess. If i found a tube that was a perfect fit I'd just RGB mode the chassis. It would be so much easier than trying to run an MS9.