Great comments on wheel choices and I concur on getting them to fit the flares to. Original style wheels are available in aluminum or magnesium, more importantly correct tire sizes are also available, and no saying how long 17" or 18" tires will continue to be available. For an authentic look, ride height and correct stance you can't beat original style IMO.
Be aware that there are variants of both steel and fiberglass flares from a number of vendors, yes some all come from the same source, but that's mostly the crap ones you don't want! Most of the steel Group 4 flares don't look right IMO as they don't have a compound curve and come in 3 pieces to weld together. Again Group 4 factory cars were fiberglass flares and they just look right.
Better Still sell your Pantera and buy Jan's car (the maroon one in the first photo) and then you will get what you want and help us all by not cutting up another Pantera...