Does anyone know if this Makita mitre saw stand fit the Mastercraft Mitre Saw?

Yes. I'm pretty sure it will.
It is a universal stand made to accommodate the wide range of mitre saws which Makita has manufactured over the years.
The base mounts have bolting slots which can accommodate saws of different sizes.

Thanks for confirming.
Too bad they didn't advertise as a "universal" stand. This would probably help with their sales. More people are likely to buy it.