My SurTrack axle assemblies arrived today...

...thats FAST service

Dont have time to break them down ( probably a Moab job avec libation.. )

But..did compare the Surtrack long side...
.... to a spare OEM long side ( Drivers) shaft and 'green cup' that I have.

Perfect length.

Spline Diam a tad different :-

OEM = 27.58mm
S/Track = 27.33mm

Close enough for me...considering my cheap caliper..
...and given the ample available spline depth to engage.

Jo