Jonathan Duder

Hi, I have a Moviola Crab Dolly and I'm trying to figure out what I can get to actually mount a tripod head onto it. There was once a Mitchell gear head with it, but that has since been misplaced, and is for cost reason not replaceable. It seems to be a 100mm bowl size, but I tried a Cartoni Gamma head and it's not wide enough. Is there some kind of adapter that might work? Thank You