I believe Hope said they're not compatible. The one I have is the newer 07 split crown race on the first gen headset they released and the rubber seal is quite a bit larger causing it to be completely smashed down down so looks like a permanently squashed pancake now. Perhaps okay for first time usage but after removal my seal looks super thin now squashed flat so not able to reuse it as the rubber is split and won't conform back to it's original much larger shape.