Main nozzle

Hello everyone, My son has an ATU Explorer Race GT 50 Bj 2012. Because he had already ridden before, we have now installed new Zylindetkit from Top Performance, remove beef in variomatics as well as throttle-free crackers, variomatics from Mallosi etc. I now want to change main nozzle against a bigger one, because the scooter now rotates significantly higher than before with throttle. Have removed the nozzle, it is M6 50 size. Total height of nozzle is 10mm, as said M6. But I find nowhere a nozzle M6 with Gesa mthöhe of 10mm, but which with 8mm. Where did you get the nozzles? Ev Link with suitable nozzle, would like to install 55-60 Thank you