Help please. 1965-66 rear quarter trim fitment question

[DEEMAN]

Despite there being so many pictures of Porsches available to me I still cannot understand how the front vertical edge of this piece of trim is held in place on the early cars. The B pillar has leatherette on it (and nothing more?). The trim has ONE tongue on it at the rear which clips into the receiver and although there is another receiver at the front it does not seem to be used. If it were then surely it would bend the trim out because of the reinforcement member.
What am I missing? One would have thought it was so straightforward but......

Ian