There is a ~30mm recessed board which is slightly smaller than the Toyo 45A/Canham boards. I don't know what camera it was intended for. The square recessed area looks like it would just clear the light baffles on the Toyo 45A/Canham boards. With quite a bit of cutting it looks like it might be possible to attach it to a modified Toyo 45A/Canham board.

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I don't know if it would clear the inside of the front standard.