Use the one you have as a pattern with similar materials and then use sander to round edges and make look like other one, redrill and mount. Or consider making two new ones so that they match. Good luck
Dan Stober
1965 20' Cruisers Inc. 570 Seacamper
1962 20' Cruisers Inc. 502
1963 16' Cruisers Inc. 202 Seafarer
Weatherford, Texas
That's my suggestion too. Make a new one. It most likely is made of white oak. If you try to salvage one from another boat it could be more effort and time and end up having decay, splits, nicks, in it, ect... Not to mention trying to find a boat to canabilize.