here's an update from my experience above (v3.0si)...
the 36146792829 stem does not need any fabrication. the new design has a thicker seal on the stem that goes through the wheel, and the included nut squeezes and self threads over this seal. a bit more torque is required to get them started over the seal in comparison to the older 36111095375. or simply...
the 1095375 had a washer built onto the nut that allowed tightening up against the wheel surface. the 6792829 uses the larger stem seal to perform the same function.
this is updated
here as well.