Hi guys. I bought the Ohlins STX 22 Air Custom 190x51 for my Canyon Spectral AL. At the unboxing I saw two types of DU Bushigns. A Larger one (that fits on the bottom) and a thinner (that fits on the top). I have 22x8mm bushigns with 12,7mm shaft diameter that fits so good on the larger one. But it doesn't fit on the thinner because (I think) it needs a 12mm like the Specialized bikes. Am I correct? Why have two different measures? Why there's no information about that? Anyone, please. Thank you.