Please help identify damper plate

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Hi,

my damper plate is shot, that is: the teeth have been stripped, so that no power is transmitted to the saildrive.

There was some custom work going on here as a previous owner had adapted a chinese engine to a Yanmar SD20. But I hope that the plate is still a standard part that does not have to be custom built.

There is a mark that seems to say BA51 on the damper.

Does anyone have an idea, who might have build these plates? The installation was done by a Swiss guy in Germany, so probably he sourced them in Europe.

Paul