The K7400/K7500/U2000/U5000 yokes are split like someone cut them too. They are not made as 2 separate housings. They were cut in the factory because the yoke was shipped with a solid connector and those chassis' didn't have the two sets of yoke pins in a single line like the K7000.
That being said, the mounting under the tube looks like a K7000 all right, but the yoke doesn't really look like a WG K7000 yoke. It might be a Zenith K7000A yoke which will work with a regular K7000 chassis...