I too did not get the collars in my package a while ago. I remember Nick from Teknik explained they are not part of the kit (bike weight etc specific), and it appears they sometimes forget to mention it (most of the time they do the fitting in the shop so it's not an issue).
Nick quickly sent collars free of charge to me, so I'm an happy buyer though.

Btw Nick suggested to weld one of the two rebound damping holes up.

I'm happy with the result on the forks, and even more happy when i consider the price. I don't remember exactly how much preload i set on the valve but also went more on the soft/quick valve opening side of the adjustment range.

I went with a bit heavier ohlins springs at the same time, and the combination of collar height, v4s valve heigh and stiffer springs leaded to the fact that i did not need spacers for preload at all. I simply had to screw the stock adjuster a fair bit in, with still room for adjustment if needed.