The Cape Dory Board

I would like to refresh this request. Could someone at least point me in the direction? Many thanks.

I bought hull #555 and the previous owner had carelessly left the original centerboard on the bottom of the lake somewhere. She had crafted a wooden one, but it cracked into pieces. I tried to fabricate one myself, but it is really hard to manage. Does anyone have one to sell? Plans to make one? Or ...