The original did have a 'plunge' fudge factor but I'm not sure if it just aided in installation tolerances or as it designed to add a little 'give' to a somewhat flexible unibody? If you were to slot it, you would probably end up with slop after a few thousand miles as the pin would be concentrating all the torsional force on 1-2 mm of that coupling receiver. Full pinning is probably the way to go, with subframe connectors. If you pressed that pin out, would it be a 3/4 DD?
