Ive bought several sets of oarlocks on ebay. Does this boat have rolled gunnels or wood trim? Full length sliding seats? Once you glass in your side and tie back in your seats and re install your wood trim your strength should be back. What I would do is make a flat mold and pull out a flat sheet the same thickness as your other side and then glass it in. If you could post some pictures and give us a better idea of what your working with it would help.