Almost all Nitto bars are 25.4 as well. MTB standard used to be 25.4. There are a LOT of bars in 25.4! There are essentially two options...spread the head out and use 25.4 stuff or have a machine shop remove a tiny bit of metal from the clamping area of the stem. .4mm can be done BY HAND with emery cloth, sandpaper or a file.