No one that I know has tried cosmetically modifying this vital structural area. Most focus on strengthening the rather flimsy attach points. The bar attach tabs are only light sheet metal welded to the inner fender panels, but are really part of the upper rear shock attach weldment. In the section of this Forum on adapting a Coyote engine where much of the inner rear fender sheet metal was cut away, a photo shows the complete weldment without the shrouding fender metal. A few owners have welded on strengthening doublers for the bar mount tabs when they were damaged. I would want to keep an eye on cracks growing in the area or loose bolts, not cover it up, but thats just me.
Those attachment tabs take much of the cornering loads from the rear suspension as well as resisting torque from acceleration & braking. Adding wider wheels and tires makes these loads higher. Having oversized, slotted holes in the stock tabs for the bar also does not improve the situation. So if you weld on doublers, make the holes much smaller to fit the bolts! Eventually, stresses and relative motion from decades of vigorous cornering strains or breaks many of the spot-welds making up the Pantera's rear monococque and we wind up with excess rear camber that is no longer factory adjustable. In a chain-reaction, excess camber then rapidly wears out the inner edges of large, expensive rear tires.