Older RL Foil Mast Clamp

Hallo, is there somewhere a 3d Model Clamp to connect mast with Motor which is the thiner and shorter old RL Mast System?

Thanks and Greets

if you have a drawing of the mast or measure it (put it on paper, draw around it, take a picture and measure width / length), maybe I can edit my clamp design to fit …