Took some measurements to figure out an adapter to get the 3/4 side of the engine case onto my engine stand. The bottom stud hole takes an M10 bolt with 1.5mm thread pitch and needs to be at least 75mm long. The upper mounting hole is 10.8mm diameter, so a 3/8 bolt should work. There is room for a 0.065" wall tube (approx 1/16") to fit before hitting the 4mm tall transmission flange. A stack of washers would work but requires cutting all 6 into a "half-moon" shape to clear.
Recommend both bolts be in the 75-100 mm (3-4") length range.