MOPED ARMY

If you are switching to sealed bearings you need all new hardware. Axle, spacers, nuts, washers, the whole deal. Axles should be 12mm "sealed bearing style" (mainly meaning smooth in the center rather than threaded all the way through)

Here is part of the puzzle for the rear wheel: https://www.treatland.tv/puch-moped-REAR-sealed-bearing-axle-12mm-x-185mm-p/puch-axle-12mm-rear-sealed.htm