To bad I don't have a REAL sidekick locking hub to look at to see what the factory did. But I have a feeling that this would be another solution. See a IFS toyota locking hub is recessed deeper than the SA Toyota locking hub. Ref:
http://www.pirate4x4.com/forum/showthread.php?p=5979707#post5979707 And from my measurements, it appears the outer part of the locking hub for a SA toyota is identical to the outer part of the locking hub for a sami. Too bad I don't have and IFS toyota hubs right now.
Possible Solution 6: Swap a Sami 22 splined hub gear into a IFS toyota locking hub body and the slide that Hybrid assembly onto the Sidekick axle. I believe this would bolt right up and is basically what Aisin did originally for the sidekick locking hubs. If I find a IFS toyota hub - I'm going to try this.
Toyota Solid Axle hub on the Left - Toyota IFS hub on the Right
