Looking for a coulter

I am guessing that plow is a walking plow? It can be hard to fit rolling coulters on some walking plows. but usually it can be done. I have seen a bracket with the groove you describe. Some of these plows came with jointers instead of coulters; but a coulter will work better for plowing sod and such. I would check with “farmer Browns Plowshop”. If you can find a coulter that will work it might come with it’s own bracket.