I can give you the rear track, which is ~65.6"
The front track 63.4" for comparison.
This rear track is about the same as '98-'02 panthers - but the overall axle axle width is a little over ~3" wider because of the VERY high positive offset wheels used on 2003+ panthers
If you need a narrower axle housing width, use the '98-'02 panther axle housing. It uses the same control arms, watts linkage and spring perches as the '03+ axle housings, it just doesn't have the shocks outboard of the frame rails.