At the moment I am favouring a fabricated mount that will attach to the end of the lower two engine studs (seen a few examples of that) and also bolt through the floor of the bellhousing (not within the area that the flywheel & clutch occupy) to provide more strength. This would avoid the need for a countersunk hole.
However, due to the position of the clutch arm, it may not work on a 915 (I have a 901).
I see how it looks when I get round to measuring up.
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