Ok so i did my homework, and here is what i found:

- OTR responded their seals were NOK or "equivalent good quality". No information on the bushings.

- Hard to find information about SKF, but their USA website lists an oil seal reference for the xt660z 2008+ (curious as it is no sold in the US...): SFK 43mm for Kayaba, the ref is OSB43k

- Innteck/SKF makes bushings, refs SKTE43K (external) and SKTI43K

- Innteck/SKF makes a complet package with all bushings, oil and dust seals, ref IN-RE43K

I bough the later one. The oil seal have a different shape than stock, so the stock clip doesn't fit well on it, but the seal as a metal ring holding it (like on the stock dust seal).

I have 500km on it so far, all seems well. I can't tell if it is because of new seals, bushings, spring, oil, or teknik emulator but wow... things are much better now. Less diving/movment, yet smoother ride.