I’m sure your right the output spline is 1.215” I think the crown one is manufactured too small.i will crack the nut on my 06 tj pitman tomorrow and check for sure the spline measurements that way I can order a Rhd mopar arm and fingers crossed it will fit.looking at the dropped xj one I took off proves your theory and is probably a lhd as the flat splines are in the opposite orientation.sorry about not getting the wag thing I had to laugh when I got it. Thanks