Adam there is a Mk111 at the Tank Museum (about 12-15 miles from where I live) It's was configured with some experimental equipment post war. See the added shafts above the wheels. I can go there at some point and take measurements (with their permission) if you show me precisely what you need.
Out of interest, the motorcycles in the series of pictures you posted are Ariel W/NG's (usually known as Ariel 'Wings') Ron
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