Some people have modified their suspensions and used coil springs for a 1966-1977 Ford Bronco. One of the problems is mounting the coil to the Dana 35 TTB axle beam. The Ranger coil is sandwiched between a coil seat and a dish shaped washer held in place by a nut on the center mounting stud.
The Ford Bronco coil sits inside of a cup and the coil slides into the square hoop that you see in the picture. You can see in the photo above that the Dana 35’s coil spring mounting stud was removed and now secures the Bronco lower mounting cup. In order to mount it, a hole has to be drilled into the center of the mounting cup for the stud to fit through.
(Extreme Duty Lower Coil Spring Cups, 66-77 Ford Bronco)
Above is a set of heavy-duty lower spring cups. In the photo below you can see that a hole was drilled into the center of the cup to mount it on the Dana 35 axle and was cut to fit around the knuckle where the steering knuckle mounts.
Others have made their own. On the one below, the coil sits around the mount and I’m guessing that the Rangers original dished cup that held the Ranger coil down goes back on and tightens down against the ring on the cup.
This is what the Bronco mounting cups look like on the Dana 44:
