The tracker 12 bolt axle and the 10 bolt third member will not interchange. Sorry its been a long week and just want to make sure i follow.

To put it simply.....10 or 12 bolt trackick rear axle parts (carrier/gears or complete third) are the only parts that will work in the rear trackick axle.

Pics showing sidekick and samurai third members:

Links were pulled from the thread shown here: Check it out. Good info.
http://www.zukikrawlers.com/archive/index.php?t-4215.html
I hope "holeshot" doesn't mind me posting them:

From left to right are sidekick 12 bolt rear, sidekick 10 bolt front, samurai 10 bolt rear:
http://www.zukikrawlers.com/albums/holeshot/000_0140.jpg

This shows the bearing spacing differences:
http://www.zukikrawlers.com/albums/holeshot/000_0176.jpg

These images don't show the sidekick 10 bolt rear but they may be of interest anyway.
Besides, other zukiworld threads make it pretty clear that the two rear sidekick thirds are interchangable. Mentioned here are some problems one might encounter:
http://www.zukiworld.com/forum/index.php?topic=16394.0

I have also been hoping to find a way to stuff my samurai gears and ARB into a sidekick axle . I want a cheap means of moving to a centered diff without changing my ratios.

I have also been hoping to find a way to stuff my samurai gears and ARB into a sidekick axle .

That's going to be pretty hard to do....the spacing of the rear trackick and samurai (front or rear) bearing caps are different.....otherwise, you could just swap the samurai carrier and gears into a trackick rear third housing.
About the only thing I can think of is...... do a reverse hybrid housing.....use the samurai center section with trackick axle tubes