More information would help - why do you need to replace the stator plate? What's the trouble? Why can't the existing stuff be repaired or components replaced.

There have been several versions of the Babetta, the first moped to use a contactless transistorised ignition, unfortunately obtaining spares, if they are available might mean buying from Germany, Czechoslovakia or Latvia.

An alternative could mean fitting a one piece ignition module from a lawn mower, chainsaw or strimmer...