will samurai gears fit in a tracker
You should be able to use samurai gears in the trackick rear too. Just use the samurai carrier.
unless the the rare 1.3liter sidekick has the smaller bolt pattern than other sidekick/trackers the sami third will not fit in the rear, its a different bolt pattern and bolt size. I have both thirds sitting side by side in the garage and everything about the sidekick rear third is bigger. Are you saying you can blend them

The 1.3 sidekicks had the large rear thirds, just like any other trackick.
From what I remember, the distance between the carrier bearings are the same (or close enough) that you can use a samurai carrier in a trackick rear third. The bearings are the same size, so there will not be any issue with the bearing caps. And the pinion bearings are the same size too, so a samurai pinion will fit in a trackick rear third just fine.
Edit.....I am going to have to think about this.....even though the carrier bearing spacing is the same, the pinion depth would be off, because of the smaller ring gear of the samurai. I must be thinking of using samurai carriers in the front of trackicks, not in the rear.