The only pics I have seen of them fitted are during the Trials. The Trials vehicles, P1 and P2 had very high canopies on the rear of the tray. Later vehicles in service had a lower roofline on the canopy, which would have seen the mounting protruding quite high and likely to foul any overhanging branches (as would the "trial" canopy itself). It may be that the Trials or Mk1 trucks had a trombone arrangement on the canopy support bows that enabled two heights to be selected, but later marks of the Inter only had one roof height.
In the very few available pics of Mk1 trucks in service, it is not usually possible to see the ball pins on the roof. Maybe the mounting was only considered during the trial, and discounted for production vehicles along with the higher canopy?
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