Hi, have a look here:https://bikers-base.de/-SALE-/Sale-Laufraeder-Co-/Sale-Naben-Zubehoer/KHE-Astern-Freecoaster-BMX-Driver-11T-RHD.htm?SessionId=&a=article&ProdNr=HH%5F02074250&p=2782
and here:https://bikers-base.de/-SALE-/Sale-Laufraeder-Co-/Sale-Naben-Zubehoer/KHE-Astern-Freecoaster-BMX-Driver-9T-RHD.htm?SessionId=&a=article&ProdNr=HH%5F02074235&p=2782I have a Federal V2 and I bought the 9T version mentioned above. It looks the same as the original Federal one.The early Reverse and Federal V1 had 15 mm inner diameter of the driver bearings, later Reverse ACB and Federal V2 had 14 mm. Keep an eye on this. But in the end this only affects the bearing and the axle, so the drive should still be compatible.I do not know about the Geisha version because I never had one. Astern, Reverse, Federal,... are basically the same, it only depends on what year it is from (as stated above).I am almost sure the ones from the links should work.