The short answer is no without fabrication. The MII (same as 74-80 Pinto) spindle is about 7/8" taller (between the ball joints) than the 71-72 spindle. I suspect this would affect the geometry. One concern is increased camber gain on bump. However I seem to remember somebody here installing the MII spindle in a 73 without complaint. Another problem is that the hole for the tie rod end is larger in the MII spindle than the 71-72 spindle. The 73 has a unique rack which uses the larger tie rod end, so the referenced person did not have a problem with this.