Spike, you've lost me there!!
I think that for the IVA they need a secondary fixing such as a bolt tapped into the mushroom, through the cast upright.
As far as calculations to back up the geometry, surely Ford 'must' have done some work on this. Although obviously the Ford upright is being used in a different situation.
And what item have you run past the local precision engineers?? The insert, the upright??
Also, what do you mean by "the stem is extended to fill the hub counter bore"??
Sean
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