Stock Roll Bars Interchangeable?

my rollbar behind the front seats is mounted on the rear wheel wells. You also need two each of the flat-iron pieces on each side to bolt down to. They go on the opposite sides of the sheet metal from the angle iron the bar is welded to.

My front bar matches my windshield angle, not the roll bar angle. Because I built the front one myself. The roll bar behind the seat was installed by a PO. The front bar and spreader bars I ordered from an outfit that makes them for Broncos and Scouts. And assembled them in my driveway with a wire-feed welder.