If you are buying the Xi sport kit, Sak U106 won't be necessary. Just make sure you have some 1mm screws.
Sak 45 is good, if you don't have any extra ball cups and ball ends lying around. The main difference is that the zero front arms require the swaybar to be bolted "on to" the arm, like most traditional touring cars (the link has a ball cup on both ends).
The Xi front arms require the swaybar to be bolted "into" the front arm. That is to say there is a ball cup attached to the swaybar, and a ball joint that directly pops into the middle of the front arm.
If you have spare ball cups and ball ends, you won't need a mounting kit. But if this is your first time with a touring car, getting Sak 45 is not a bad idea.
Again, don't worry too much about swaybars. It's going to be 3 or 4 weeks before your kit arrives to canada (unless you paid for express shipping). Get used to how the car handles and then start tuning with different springs and swaybars. By the time you get the kit, Xi swaybars will probably be in stock again anyways.
Or just pick up Kamlooper's Xi. You'll have it in less than a week and be loaded with goodies. In a month, when your dinball order finally arrives, you'll have the spare parts that you need.