Hey Steve,
Yak Gear stabilizer pontoons now use Railblazer compatible star mounts. That must be an earlier version?
You might try messaging Yak Gear
https://yakgear.com/contact/
Or, If the male post can be unscrewed, replace it with a Railblazer star base component.
https://www.railblaza.com/uses/spare-parts/
Good luck.